May guide to the bright planets

Click the name of a planet to learn more about its visibility in May 2019: Venus, Jupiter, Saturn, Mars and Mercury.

Chart showing thin crescent moon and Venus, April 30 and May 1, 2019, Northern Hemisphere.

For far-northern latitudes, like Alaska, viewing the moon and Venus in late April and early May 2019 will be difficult because the pair will rise about the same time as the sun. Elsewhere in the Northern Hemisphere, the moon and Venus will be a fragile and beautiful sight in the dawn. Read more.

Chart showing thin crescent moon and Venus, late April and early May 2019, Southern Hemisphere.

The Southern Hemisphere has the advantage for catching the moon, Venus and Mercury in late April and early May 2019. From there, they appear more directly above the sunrise. Read more.

Venus is the brightest planet, beaming in the east before sunrise all month long. Watch for the waning crescent moon to join up with Venus in the morning sky for a few days, centered on or near May 1 – and then again on June 1 (see June chart below).

From northerly latitudes, Venus sits low in the glare of morning twilight. The northern tropics and Southern Hemisphere enjoy a much better view of Venus. For all of us, Venus starts out the month at an elongation of 28 degrees west of the sun. It ends the month at 20 degrees west of the sun. Despite Venus being the same angular distance from the sun worldwide, Venus spends more time in the predawn sky at more southerly latitudes. That’s because the ecliptic – or path of the sun, moon and planets – appears more nearly vertical with respect to the sunrise horizon from southerly latitudes at this time of year.

In May, at mid-northern latitudes, Venus rises well after the beginning of astronomical twilight (dawn’s first light). At temperate latitudes in the Southern Hemisphere, Venus comes up before the advent of astronomical twilight all through May 2019.

Click here to find out when astronomical twilight comes to your sky, remembering to check the astronomical twilight box.

At mid-northern latitudes, Venus rises about one hour before sunrise throughout the month.

At temperate latitudes in the Southern Hemisphere, Venus rises about two hours before sunup in early May. By the month’s end that’ll decrease to about 1 1/2 hours.

Let the waning crescent moon serve as your guide to the planet Venus, centered on or near May 1 – and then again, on or near June 1. See the sky chart for the late May/early June below.

Chart showing thin crescent moon and Venus in morning sky.

The waning crescent moon pairs up with the queen planet Venus on or near June 1. Read more.

Mercury, the innermost planet of the solar system, passes out of the morning sky and into the evening sky in May 2019. From the northern tropics and the Southern Hemisphere, Mercury might be visible for the first week or so of May. Northerly latitudes will have a tough time catching Mercury, even with binoculars.

On the other hand, in June 2019, Mercury will become a fine evening object from both the Northern and Southern Hemispheres.

If you live in the northern tropics or the Southern Hemisphere, watch for the moon to pair up with Mercury on or near May 3, as shown on the sky chart above. If you’re in the Northern Hemisphere on May 2, you’ll find the moon and Mercury exceedingly low in the sky before sunup; they might not be visible. See the chart below.

Sky chart of very thin crescent moon and Mercury beneath Venus on April 2, 2019

As viewed from the Northern Hemisphere, it’ll be quite a challenge to spot Mercury in late April and early May, 2019. This chart shows May 2, when the moon and Mercury will be beneath Venus. Will you see them? It’ll be tough!

Jupiter is the second-brightest planet after Venus, and this planet is now rising earlier in our sky, coming into view at late evening in early May, and by dusk/early evening in late May. Jupiter is now approaching its opposition to the sun – marking the middle of the best time of year to see it – and so you’ll want to view Jupiter in the coming weeks. Opposition itself comes on June 10, 2019. Around that time, Jupiter will shine at its brilliant best for the year. Click here for a recommended sky almanac telling you when Jupiter rises into your sky.

That bright ruddy star rather close to Jupiter is Antares, the brightest star in the constellation Scorpius the Scorpion. Although Jupiter shines in the vicinity of Antares throughout 2019, Jupiter can be seen to wander relative to this “fixed” star of the zodiac. This year, in the first three months of 2019, Jupiter was traveling eastward, away from Antares. But starting on April 10, 2019, Jupiter reversed course, moving toward Antares. For the following four months (April 10 to August 11, 2019), Jupiter will be traveling in retrograde (or westward), closing the gap between itself and the star Antares. Midway through this retrograde, Jupiter will reach opposition.

In early May from mid-northern latitudes, Jupiter rises at late evening, roughly 11 p.m. daylight time. By the month’s end, Jupiter rises around nightfall.

At the beginning of the month at temperate latitudes in the Southern Hemisphere, Jupiter comes up by mid-evening, around 8 to 9 p.m. By the month’s end, Jupiter rises around nightfall.

Jupiter comes up first in the nightly procession of three bright planets. Saturn follows Jupiter into the sky about two hours after Jupiter first appears, and then Venus makes its appearance low in the eastern sky at dawn.

Watch for the waning gibbous moon to swing by Jupiter on the evenings of May 19 and 20, as displayed on the sky chart below.

Sky chart of the nearly full moon and Jupiter

Look for the moon near the king planet Jupiter on May 19 and 20. Read more.

Saturn comes up up a few hours after Jupiter. Throughout May, Saturn and Jupiter rise earlier each day, both of them making their appearance about two hours earlier by the month’s end. Saturn, although as bright as a 1st-magnitude star, pales in contrast to Jupiter. Jupiter outshines Saturn by some 14 times.

From mid-northern latitudes, Saturn comes up around the midnight hour (1 a.m. daylight saving time) in early May. By the month’s end, Saturn rises by around 11 p.m. daylight saving time.

From temperate latitudes in the Southern Hemisphere, Saturn comes up around two hours before the midnight hour in early May. As a reminder, midnight in our usage means midway between sunset and sunrise. By the month’s end, Saturn will rise at or around 8 p.m.

Watch for the waning moon to be in the neighborhood of Saturn for several days, centered around May 22 or 23, as shown on the sky chart below.

Sky chart of the nearly full moon, Jupiter and Saturn in the May morning sky.

Unless you’re a night owl, you might want to view the moon and Saturn in the predawn/dawn sky. Read more.

Mars is the only bright planet to come out at nightfall all month long. “Bright” might be an overstatement, as Mars has faded into 2nd-magnitude brightness. Even so, Mars stays out until after nightfall. Given a dark sky, you should be able to spot this world in your western at early evening.

Click here for recommended sky almanacs providing you with the setting times for Mars for your location.

Watch for the young crescent moon to shine in the vicinity of Mars for several evenings, centered on or near May 7. The moon’s proximity might provide you with your best opportunity to catch Mars in the evening sky for the rest of 2019. Day by day, this planet is slowly but surely fading, and sinking closer to the afterglow of sunset.

Sky chart of the May 2019 young moon, Mars, 4 stars.

Use the young crescent moon to locate Mars in your western sky as darkness falls. .

What do we mean by bright planet? By bright planet, we mean any solar system planet that is easily visible without an optical aid and that has been watched by our ancestors since time immemorial. In their outward order from the sun, the five bright planets are Mercury, Venus, Mars, Jupiter and Saturn. These planets actually do appear bright in our sky. They are typically as bright as – or brighter than – the brightest stars. Plus, these relatively nearby worlds tend to shine with a steadier light than the distant, twinkling stars. You can spot them, and come to know them as faithful friends, if you try.

silhouette of man against the sunset sky with bright planet and crescent moon.

Skywatcher, by Predrag Agatonovic.

Bottom line: In May, Mars is the only bright planet to pop out at nightfall all month long. Jupiter rises in the east at mid-to-late evening, whereas Saturn follows Jupiter into the sky about two hours after Jupiter does. Venus sits low in the glare of morning twilight all month long. Mercury is pretty much unobservable from northerly latitudes. Click here for recommended almanacs; they can help you know when the planets rise and set in your sky.

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Visit EarthSky’s Best Places to Stargaze, and recommend a place we can all enjoy. Zoom out for worldwide map.

Help EarthSky keep going! Donate now.

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Click the name of a planet to learn more about its visibility in May 2019: Venus, Jupiter, Saturn, Mars and Mercury.

Chart showing thin crescent moon and Venus, April 30 and May 1, 2019, Northern Hemisphere.

For far-northern latitudes, like Alaska, viewing the moon and Venus in late April and early May 2019 will be difficult because the pair will rise about the same time as the sun. Elsewhere in the Northern Hemisphere, the moon and Venus will be a fragile and beautiful sight in the dawn. Read more.

Chart showing thin crescent moon and Venus, late April and early May 2019, Southern Hemisphere.

The Southern Hemisphere has the advantage for catching the moon, Venus and Mercury in late April and early May 2019. From there, they appear more directly above the sunrise. Read more.

Venus is the brightest planet, beaming in the east before sunrise all month long. Watch for the waning crescent moon to join up with Venus in the morning sky for a few days, centered on or near May 1 – and then again on June 1 (see June chart below).

From northerly latitudes, Venus sits low in the glare of morning twilight. The northern tropics and Southern Hemisphere enjoy a much better view of Venus. For all of us, Venus starts out the month at an elongation of 28 degrees west of the sun. It ends the month at 20 degrees west of the sun. Despite Venus being the same angular distance from the sun worldwide, Venus spends more time in the predawn sky at more southerly latitudes. That’s because the ecliptic – or path of the sun, moon and planets – appears more nearly vertical with respect to the sunrise horizon from southerly latitudes at this time of year.

In May, at mid-northern latitudes, Venus rises well after the beginning of astronomical twilight (dawn’s first light). At temperate latitudes in the Southern Hemisphere, Venus comes up before the advent of astronomical twilight all through May 2019.

Click here to find out when astronomical twilight comes to your sky, remembering to check the astronomical twilight box.

At mid-northern latitudes, Venus rises about one hour before sunrise throughout the month.

At temperate latitudes in the Southern Hemisphere, Venus rises about two hours before sunup in early May. By the month’s end that’ll decrease to about 1 1/2 hours.

Let the waning crescent moon serve as your guide to the planet Venus, centered on or near May 1 – and then again, on or near June 1. See the sky chart for the late May/early June below.

Chart showing thin crescent moon and Venus in morning sky.

The waning crescent moon pairs up with the queen planet Venus on or near June 1. Read more.

Mercury, the innermost planet of the solar system, passes out of the morning sky and into the evening sky in May 2019. From the northern tropics and the Southern Hemisphere, Mercury might be visible for the first week or so of May. Northerly latitudes will have a tough time catching Mercury, even with binoculars.

On the other hand, in June 2019, Mercury will become a fine evening object from both the Northern and Southern Hemispheres.

If you live in the northern tropics or the Southern Hemisphere, watch for the moon to pair up with Mercury on or near May 3, as shown on the sky chart above. If you’re in the Northern Hemisphere on May 2, you’ll find the moon and Mercury exceedingly low in the sky before sunup; they might not be visible. See the chart below.

Sky chart of very thin crescent moon and Mercury beneath Venus on April 2, 2019

As viewed from the Northern Hemisphere, it’ll be quite a challenge to spot Mercury in late April and early May, 2019. This chart shows May 2, when the moon and Mercury will be beneath Venus. Will you see them? It’ll be tough!

Jupiter is the second-brightest planet after Venus, and this planet is now rising earlier in our sky, coming into view at late evening in early May, and by dusk/early evening in late May. Jupiter is now approaching its opposition to the sun – marking the middle of the best time of year to see it – and so you’ll want to view Jupiter in the coming weeks. Opposition itself comes on June 10, 2019. Around that time, Jupiter will shine at its brilliant best for the year. Click here for a recommended sky almanac telling you when Jupiter rises into your sky.

That bright ruddy star rather close to Jupiter is Antares, the brightest star in the constellation Scorpius the Scorpion. Although Jupiter shines in the vicinity of Antares throughout 2019, Jupiter can be seen to wander relative to this “fixed” star of the zodiac. This year, in the first three months of 2019, Jupiter was traveling eastward, away from Antares. But starting on April 10, 2019, Jupiter reversed course, moving toward Antares. For the following four months (April 10 to August 11, 2019), Jupiter will be traveling in retrograde (or westward), closing the gap between itself and the star Antares. Midway through this retrograde, Jupiter will reach opposition.

In early May from mid-northern latitudes, Jupiter rises at late evening, roughly 11 p.m. daylight time. By the month’s end, Jupiter rises around nightfall.

At the beginning of the month at temperate latitudes in the Southern Hemisphere, Jupiter comes up by mid-evening, around 8 to 9 p.m. By the month’s end, Jupiter rises around nightfall.

Jupiter comes up first in the nightly procession of three bright planets. Saturn follows Jupiter into the sky about two hours after Jupiter first appears, and then Venus makes its appearance low in the eastern sky at dawn.

Watch for the waning gibbous moon to swing by Jupiter on the evenings of May 19 and 20, as displayed on the sky chart below.

Sky chart of the nearly full moon and Jupiter

Look for the moon near the king planet Jupiter on May 19 and 20. Read more.

Saturn comes up up a few hours after Jupiter. Throughout May, Saturn and Jupiter rise earlier each day, both of them making their appearance about two hours earlier by the month’s end. Saturn, although as bright as a 1st-magnitude star, pales in contrast to Jupiter. Jupiter outshines Saturn by some 14 times.

From mid-northern latitudes, Saturn comes up around the midnight hour (1 a.m. daylight saving time) in early May. By the month’s end, Saturn rises by around 11 p.m. daylight saving time.

From temperate latitudes in the Southern Hemisphere, Saturn comes up around two hours before the midnight hour in early May. As a reminder, midnight in our usage means midway between sunset and sunrise. By the month’s end, Saturn will rise at or around 8 p.m.

Watch for the waning moon to be in the neighborhood of Saturn for several days, centered around May 22 or 23, as shown on the sky chart below.

Sky chart of the nearly full moon, Jupiter and Saturn in the May morning sky.

Unless you’re a night owl, you might want to view the moon and Saturn in the predawn/dawn sky. Read more.

Mars is the only bright planet to come out at nightfall all month long. “Bright” might be an overstatement, as Mars has faded into 2nd-magnitude brightness. Even so, Mars stays out until after nightfall. Given a dark sky, you should be able to spot this world in your western at early evening.

Click here for recommended sky almanacs providing you with the setting times for Mars for your location.

Watch for the young crescent moon to shine in the vicinity of Mars for several evenings, centered on or near May 7. The moon’s proximity might provide you with your best opportunity to catch Mars in the evening sky for the rest of 2019. Day by day, this planet is slowly but surely fading, and sinking closer to the afterglow of sunset.

Sky chart of the May 2019 young moon, Mars, 4 stars.

Use the young crescent moon to locate Mars in your western sky as darkness falls. .

What do we mean by bright planet? By bright planet, we mean any solar system planet that is easily visible without an optical aid and that has been watched by our ancestors since time immemorial. In their outward order from the sun, the five bright planets are Mercury, Venus, Mars, Jupiter and Saturn. These planets actually do appear bright in our sky. They are typically as bright as – or brighter than – the brightest stars. Plus, these relatively nearby worlds tend to shine with a steadier light than the distant, twinkling stars. You can spot them, and come to know them as faithful friends, if you try.

silhouette of man against the sunset sky with bright planet and crescent moon.

Skywatcher, by Predrag Agatonovic.

Bottom line: In May, Mars is the only bright planet to pop out at nightfall all month long. Jupiter rises in the east at mid-to-late evening, whereas Saturn follows Jupiter into the sky about two hours after Jupiter does. Venus sits low in the glare of morning twilight all month long. Mercury is pretty much unobservable from northerly latitudes. Click here for recommended almanacs; they can help you know when the planets rise and set in your sky.

Don’t miss anything. Subscribe to EarthSky News by email

Visit EarthSky’s Best Places to Stargaze, and recommend a place we can all enjoy. Zoom out for worldwide map.

Help EarthSky keep going! Donate now.

Post your planet photos at EarthSky Community Photos



from EarthSky http://bit.ly/1YD00CF

Preparing for asteroid Apophis

Animation of Earth, orbited by dots of satelllites, with the asteroid sweeping past.

This animation shows the distance between the Apophis asteroid and Earth at the time of the asteroid’s closest approach in 2029. The blue dots are manmade satellites orbiting our planet, and the pink represents the International Space Station. Image via NASA/JPL-Caltech.

Asteroid experts are meeting this week in College Park, Maryland at the 2019 Planetary Defense Conference. This conference brings together world experts to discuss:

… the threat to Earth posed by asteroids and comets and actions that might be taken to deflect a threatening object.

Yes. Movies and sci fi novels notwithstanding, professional astronomers really do talk of such things, as, over the past several decades, the potential threat to Earth from asteroid impacts has become better understood. One topic of high interest for the week is happening today (April 30, 2019). It’s a session on the 2029 passage of an asteroid known as 99942 Apophis. The scientists will be talking about a range of topics about asteroid Apophis including how to observe it when it passes Earth in 2029, as well as hypothetical missions we could send out to the asteroid. NASA wrote of this asteroid:

On April 13, 2029, a speck of light will streak across the sky, getting brighter and faster. At one point it will travel more than the width of the full moon within a minute and it will get as bright as the stars in the Little Dipper. But it won’t be a satellite or an airplane – it will be a 1,100-foot-wide (340-meter-wide) near-Earth asteroid called 99942 Apophis that will cruise harmlessly by Earth, about 19,000 miles (31,000 km) above the surface. That’s within the distance that some of our spacecraft that orbit Earth.

Asteroid Apophis – unfortunately named for an ancient Egyptian “lord of chaos” – has been known since 2004. It is a near-Earth object (NEO); that is, its orbit – which is less than one earthly year long – brings it near Earth periodically. This asteroid caused a brief period of concern shortly after its discovery in 2004. When relatively few observations of its orbit were in hand – and thus its orbit wasn’t known with much certainty – there was, for a time, a probability of up to 2.7% that it would hit Earth on April 13, 2029. That possibility became lower and lower as astronomers used both optical and radar telescopes to track Apophis over subsequent years, and got a better understanding of its orbit. A strike in 2029 was entirely ruled out during a 2013 pass of the asteroid. Still, in 2004, during its time of infamy as an asteroid that might strike Earth, Apophis set the record for the highest rating on the Torino scale, reaching level 4 on by the end of that year.

Long-exposure image of stars, with a tiny dot - the asteroid - circled in the center of them.

Astronomers discovered asteroid Apophis on June 19, 2004. At first, when its orbit was not well understood, there was brief concern it had the potential to strike Earth in this century. Image via UH/IA/NASA.

There was also brief talk of asteroid Apophis possibly striking Earth during its 2036 pass. However, the 2036 possibility has also been ruled out.

As of 2014, the diameter of Apophis is estimated to be approximately 1,210 ft (370 meters). That’s hardly a world-destroying size, but an asteroid of this size could obliterate a city. According to some estimates, an asteroid the size of Apophis can be expected to strike Earth about every 80,000 years. For comparison, the object that struck Earth during the 1908 Tunguska event had an estimated size of 200 to 620 feet (60 to 190 meters).

That’s why the 2029 pass of asteroid Apophis has such high interest for scientists. NASA said that, although scientists have spotted small asteroids, on the order of 5-10 meters, flying by Earth at a similar distance, asteroids the size of Apophis are far fewer in number and so do not pass this close to Earth as often.

During the April 30 discussion session at the Planetary Defense Conference, astronomers are gathering to discuss observation plans and science opportunities for the 2029 pass of asteroid Apophis. Marina Brozovic, a radar scientist at NASA’s Jet Propulsion Laboratory in Pasadena, California, who works on radar observations of near-Earth objects (NEOs), said:

The Apophis close approach in 2029 will be an incredible opportunity for science. We’ll observe the asteroid with both optical and radar telescopes. With radar observations, we might be able to see surface details that are only a few meters in size.

They’ll also be trying to make a close-up study of the Apophis’ size, shape, composition and possibly even its interior. At this week’s conference, scientists will be discussing questions like:

– How will Earth’s gravity affect the asteroid as it passes by?

– Can we use Apophis’ flyby to learn about an asteroid’s interior?

– Should we send a spacecraft mission to Apophis?

Models of asteroid shapes.

A model of the shape of asteroid Apophis, generated from its light curve and assuming that all areas of the asteroid have a similar albedo and reflectivity, via the Database of Asteroid Models from Inversion Techniques (DAMIT) and and Wikimedia Commons.

Davide Farnocchia, an astronomer at JPL’s Center for Near Earth Objects Studies (CNEOS), who is co-chairing the April 30 session on Apophis with Brozovic, said:

We already know that the close encounter with Earth will change Apophis’ orbit, but our models also show the close approach could change the way this asteroid spins, and it is possible that there will be some surface changes, like small avalanches.

Paul Chodas, director of NASA’s Center for NEO Studies (CNEOS), said:

Apophis is a representative of about 2,000 currently known Potentially Hazardous Asteroids (PHAs). By observing Apophis during its 2029 flyby, we will gain important scientific knowledge that could one day be used for planetary defense.

NASA said that asteroid Apophis will look “like a moving star-like point of light” to earthly observers during the 2029 pass. It said the asteroid:

… will first become visible to the unaided eye in the night sky over the Southern Hemisphere, flying above Earth from the east coast to the west coast of Australia. It will be mid-morning on the East Coast of the United States when Apophis is above Australia. It will then cross the Indian Ocean, and by the afternoon in the eastern U.S. it will have crossed the equator, still moving west, above Africa. At closest approach, just before 6 p.m. EDT, Apophis will be over the Atlantic Ocean – and it will move so fast that it will cross the Atlantic in just an hour. By 7 p.m. EDT, the asteroid will have crossed over the United States.

Astronomers will be watching!

For more information about asteroids and near-Earth objects, visit: http://www.jpl.nasa.gov/asteroidwatch Updates about near-Earth objects are also available by following AsteroidWatch on Twitter at http://www.twitter.com/asteroidwatch.

Bottom line: Astronomers are meeting April 30, 2019 at the Planetary Defense Conference to discuss plans to observe asteroid 99942 Apophis, a relatively large asteroid that’ll sweep past Earth safely – but rather closely – a decade from now.



from EarthSky http://bit.ly/2GO6gpW
Animation of Earth, orbited by dots of satelllites, with the asteroid sweeping past.

This animation shows the distance between the Apophis asteroid and Earth at the time of the asteroid’s closest approach in 2029. The blue dots are manmade satellites orbiting our planet, and the pink represents the International Space Station. Image via NASA/JPL-Caltech.

Asteroid experts are meeting this week in College Park, Maryland at the 2019 Planetary Defense Conference. This conference brings together world experts to discuss:

… the threat to Earth posed by asteroids and comets and actions that might be taken to deflect a threatening object.

Yes. Movies and sci fi novels notwithstanding, professional astronomers really do talk of such things, as, over the past several decades, the potential threat to Earth from asteroid impacts has become better understood. One topic of high interest for the week is happening today (April 30, 2019). It’s a session on the 2029 passage of an asteroid known as 99942 Apophis. The scientists will be talking about a range of topics about asteroid Apophis including how to observe it when it passes Earth in 2029, as well as hypothetical missions we could send out to the asteroid. NASA wrote of this asteroid:

On April 13, 2029, a speck of light will streak across the sky, getting brighter and faster. At one point it will travel more than the width of the full moon within a minute and it will get as bright as the stars in the Little Dipper. But it won’t be a satellite or an airplane – it will be a 1,100-foot-wide (340-meter-wide) near-Earth asteroid called 99942 Apophis that will cruise harmlessly by Earth, about 19,000 miles (31,000 km) above the surface. That’s within the distance that some of our spacecraft that orbit Earth.

Asteroid Apophis – unfortunately named for an ancient Egyptian “lord of chaos” – has been known since 2004. It is a near-Earth object (NEO); that is, its orbit – which is less than one earthly year long – brings it near Earth periodically. This asteroid caused a brief period of concern shortly after its discovery in 2004. When relatively few observations of its orbit were in hand – and thus its orbit wasn’t known with much certainty – there was, for a time, a probability of up to 2.7% that it would hit Earth on April 13, 2029. That possibility became lower and lower as astronomers used both optical and radar telescopes to track Apophis over subsequent years, and got a better understanding of its orbit. A strike in 2029 was entirely ruled out during a 2013 pass of the asteroid. Still, in 2004, during its time of infamy as an asteroid that might strike Earth, Apophis set the record for the highest rating on the Torino scale, reaching level 4 on by the end of that year.

Long-exposure image of stars, with a tiny dot - the asteroid - circled in the center of them.

Astronomers discovered asteroid Apophis on June 19, 2004. At first, when its orbit was not well understood, there was brief concern it had the potential to strike Earth in this century. Image via UH/IA/NASA.

There was also brief talk of asteroid Apophis possibly striking Earth during its 2036 pass. However, the 2036 possibility has also been ruled out.

As of 2014, the diameter of Apophis is estimated to be approximately 1,210 ft (370 meters). That’s hardly a world-destroying size, but an asteroid of this size could obliterate a city. According to some estimates, an asteroid the size of Apophis can be expected to strike Earth about every 80,000 years. For comparison, the object that struck Earth during the 1908 Tunguska event had an estimated size of 200 to 620 feet (60 to 190 meters).

That’s why the 2029 pass of asteroid Apophis has such high interest for scientists. NASA said that, although scientists have spotted small asteroids, on the order of 5-10 meters, flying by Earth at a similar distance, asteroids the size of Apophis are far fewer in number and so do not pass this close to Earth as often.

During the April 30 discussion session at the Planetary Defense Conference, astronomers are gathering to discuss observation plans and science opportunities for the 2029 pass of asteroid Apophis. Marina Brozovic, a radar scientist at NASA’s Jet Propulsion Laboratory in Pasadena, California, who works on radar observations of near-Earth objects (NEOs), said:

The Apophis close approach in 2029 will be an incredible opportunity for science. We’ll observe the asteroid with both optical and radar telescopes. With radar observations, we might be able to see surface details that are only a few meters in size.

They’ll also be trying to make a close-up study of the Apophis’ size, shape, composition and possibly even its interior. At this week’s conference, scientists will be discussing questions like:

– How will Earth’s gravity affect the asteroid as it passes by?

– Can we use Apophis’ flyby to learn about an asteroid’s interior?

– Should we send a spacecraft mission to Apophis?

Models of asteroid shapes.

A model of the shape of asteroid Apophis, generated from its light curve and assuming that all areas of the asteroid have a similar albedo and reflectivity, via the Database of Asteroid Models from Inversion Techniques (DAMIT) and and Wikimedia Commons.

Davide Farnocchia, an astronomer at JPL’s Center for Near Earth Objects Studies (CNEOS), who is co-chairing the April 30 session on Apophis with Brozovic, said:

We already know that the close encounter with Earth will change Apophis’ orbit, but our models also show the close approach could change the way this asteroid spins, and it is possible that there will be some surface changes, like small avalanches.

Paul Chodas, director of NASA’s Center for NEO Studies (CNEOS), said:

Apophis is a representative of about 2,000 currently known Potentially Hazardous Asteroids (PHAs). By observing Apophis during its 2029 flyby, we will gain important scientific knowledge that could one day be used for planetary defense.

NASA said that asteroid Apophis will look “like a moving star-like point of light” to earthly observers during the 2029 pass. It said the asteroid:

… will first become visible to the unaided eye in the night sky over the Southern Hemisphere, flying above Earth from the east coast to the west coast of Australia. It will be mid-morning on the East Coast of the United States when Apophis is above Australia. It will then cross the Indian Ocean, and by the afternoon in the eastern U.S. it will have crossed the equator, still moving west, above Africa. At closest approach, just before 6 p.m. EDT, Apophis will be over the Atlantic Ocean – and it will move so fast that it will cross the Atlantic in just an hour. By 7 p.m. EDT, the asteroid will have crossed over the United States.

Astronomers will be watching!

For more information about asteroids and near-Earth objects, visit: http://www.jpl.nasa.gov/asteroidwatch Updates about near-Earth objects are also available by following AsteroidWatch on Twitter at http://www.twitter.com/asteroidwatch.

Bottom line: Astronomers are meeting April 30, 2019 at the Planetary Defense Conference to discuss plans to observe asteroid 99942 Apophis, a relatively large asteroid that’ll sweep past Earth safely – but rather closely – a decade from now.



from EarthSky http://bit.ly/2GO6gpW

Black hole’s gravity seen tugging on nearby space

V404 Cygni Black Hole Animation from ICRAR on Vimeo.

The National Radio Astronomy Observatory (NRAO) said on April 29, 2019, that astronomers have spied a relatively modest black hole, which nonetheless features jets of fast-moving material that are wobbling or precessing so fast their change in direction can be seen in only minutes. This sort of wobble – witnessed before among black hole jets, but not on such short timescales – happens in a way that requires an effect of Einstein’s general theory of relativity. It happens because, as the black hole spins, its powerful gravity is dragging along nearby space itself.

James Miller-Jones of Australia’s International Centre for Radio Astronomy Research led researchers in this study. He and his team employed the Very Long Baseline Array, a system of 10 radio telescopes located in various U.S. states and remotely operated from Socorro, New Mexico. They studied a black hole known as V404 Cygni, which isn’t a supermassive black hole lodged in the center of a galaxy, but just an ordinary nine-solar-mass black hole, located only 8,000 light-years from Earth in our Milky Way galaxy. NRAO said in a statement:

The black hole is drawing in material from a companion star with a mass about 70 percent that of our sun. As the material streams toward the black hole, it forms a rotating disk, called an accretion disk, surrounding the black hole.

In such systems, the disk becomes denser and hotter with decreasing distance from the black hole. Either the innermost portion of the disk or the black hole itself launches jets of material outward away from the disk. The astronomers said V404 Cygni’s jet material moves as fast as 60 percent of the speed of light.

These jets are precessing or wobbling so fast, the scientists said, that Einstein’s general theory of relativity is needed to explain them. According to Einstein, massive objects like black holes distort space and time. Further, when such a massive object is spinning, its gravitational influence pulls space and time around with it, an effect called frame-dragging. NRAO said:

In V404 Cygni, the black hole’s spin axis is misaligned from the plane of its orbit with the companion star. That causes the frame-dragging effect to warp the inner part of the disk, then pull the warped portion around with it. Since the jets originate from either the inner disk or the black hole, this changes the jet orientation, producing the wobbling observed with the Very Long Baseline Array.

Miller-Jones said:

This is the only mechanism we can think of that can explain the rapid precession we see in V404 Cygni. You can think of it like the wobble of a spinning top as it slows down, only in this case, the wobble is caused by Einstein’s general theory of relativity.

Slanted blue donut in middle of orange disk with blue jet coming out vertical to the donut.

Artist’s concept of the inner accretion disk of black hole V404 Cygni. The entire accretion disk is about 10 million km (6.2 million miles) wide. The inner few thousand km are warped. That inner part also is puffed up by strong radiation pressure into a doughnut shape that wobbles, or precesses, like a rigid body. Image via NRAO.

Normally, astronomers will produce a single image of a system of this sort, using data collected over as much as several hours, like a long time-exposure photograph. The rapid direction changes of the jets of V404 Cygni meant these astronomers had to change their observation strategy. Team member Alex Tetarenko said:

These jets were changing so fast that in a four-hour image we saw just a blur.

To capture the jets’ rapid motion, the researchers made 103 individual images, each about 70 seconds long, then combined them to make a movie.

Team member Greg Sivakoff commented:

We were gobsmacked by what we saw in this system. It was completely unexpected. Finding this astronomical first has deepened our understanding of how black holes and galaxy formation can work. It tells us a little more about that big question: ‘How did we get here?’

He said the finding indicates that similar behavior might be found in other objects.

Read more about V404 Cygni, which came to astronomers’ attention via a 2015 outburst.

Red star feeding black hole accretion disk, with wobbling jets coming from the hole.

Artist’s concept of black hole V404 Cygni, on right. At left you see the normal star in orbit with the hole. Material from the star falls towards the black hole and spirals inwards in an accretion disk, with powerful jets being launched from the inner regions close to the black hole. Image via ICRAR/NRAO.

Bottom line: Jets of fast-moving material shot from the area surrounding a black hole are wobbling so fast that their change in direction can be seen in periods as short as minutes, and astronomers say it’s happening because the rotating black hole’s powerful gravitational pull is dragging nearby space itself along with it.

Source: Miller-Jones, Tetarenko, and Sivakoff, along with colleagues from around the world, are reporting their results in the scientific journal Nature.

Via NRAO



from EarthSky http://bit.ly/2UIFUuw

V404 Cygni Black Hole Animation from ICRAR on Vimeo.

The National Radio Astronomy Observatory (NRAO) said on April 29, 2019, that astronomers have spied a relatively modest black hole, which nonetheless features jets of fast-moving material that are wobbling or precessing so fast their change in direction can be seen in only minutes. This sort of wobble – witnessed before among black hole jets, but not on such short timescales – happens in a way that requires an effect of Einstein’s general theory of relativity. It happens because, as the black hole spins, its powerful gravity is dragging along nearby space itself.

James Miller-Jones of Australia’s International Centre for Radio Astronomy Research led researchers in this study. He and his team employed the Very Long Baseline Array, a system of 10 radio telescopes located in various U.S. states and remotely operated from Socorro, New Mexico. They studied a black hole known as V404 Cygni, which isn’t a supermassive black hole lodged in the center of a galaxy, but just an ordinary nine-solar-mass black hole, located only 8,000 light-years from Earth in our Milky Way galaxy. NRAO said in a statement:

The black hole is drawing in material from a companion star with a mass about 70 percent that of our sun. As the material streams toward the black hole, it forms a rotating disk, called an accretion disk, surrounding the black hole.

In such systems, the disk becomes denser and hotter with decreasing distance from the black hole. Either the innermost portion of the disk or the black hole itself launches jets of material outward away from the disk. The astronomers said V404 Cygni’s jet material moves as fast as 60 percent of the speed of light.

These jets are precessing or wobbling so fast, the scientists said, that Einstein’s general theory of relativity is needed to explain them. According to Einstein, massive objects like black holes distort space and time. Further, when such a massive object is spinning, its gravitational influence pulls space and time around with it, an effect called frame-dragging. NRAO said:

In V404 Cygni, the black hole’s spin axis is misaligned from the plane of its orbit with the companion star. That causes the frame-dragging effect to warp the inner part of the disk, then pull the warped portion around with it. Since the jets originate from either the inner disk or the black hole, this changes the jet orientation, producing the wobbling observed with the Very Long Baseline Array.

Miller-Jones said:

This is the only mechanism we can think of that can explain the rapid precession we see in V404 Cygni. You can think of it like the wobble of a spinning top as it slows down, only in this case, the wobble is caused by Einstein’s general theory of relativity.

Slanted blue donut in middle of orange disk with blue jet coming out vertical to the donut.

Artist’s concept of the inner accretion disk of black hole V404 Cygni. The entire accretion disk is about 10 million km (6.2 million miles) wide. The inner few thousand km are warped. That inner part also is puffed up by strong radiation pressure into a doughnut shape that wobbles, or precesses, like a rigid body. Image via NRAO.

Normally, astronomers will produce a single image of a system of this sort, using data collected over as much as several hours, like a long time-exposure photograph. The rapid direction changes of the jets of V404 Cygni meant these astronomers had to change their observation strategy. Team member Alex Tetarenko said:

These jets were changing so fast that in a four-hour image we saw just a blur.

To capture the jets’ rapid motion, the researchers made 103 individual images, each about 70 seconds long, then combined them to make a movie.

Team member Greg Sivakoff commented:

We were gobsmacked by what we saw in this system. It was completely unexpected. Finding this astronomical first has deepened our understanding of how black holes and galaxy formation can work. It tells us a little more about that big question: ‘How did we get here?’

He said the finding indicates that similar behavior might be found in other objects.

Read more about V404 Cygni, which came to astronomers’ attention via a 2015 outburst.

Red star feeding black hole accretion disk, with wobbling jets coming from the hole.

Artist’s concept of black hole V404 Cygni, on right. At left you see the normal star in orbit with the hole. Material from the star falls towards the black hole and spirals inwards in an accretion disk, with powerful jets being launched from the inner regions close to the black hole. Image via ICRAR/NRAO.

Bottom line: Jets of fast-moving material shot from the area surrounding a black hole are wobbling so fast that their change in direction can be seen in periods as short as minutes, and astronomers say it’s happening because the rotating black hole’s powerful gravitational pull is dragging nearby space itself along with it.

Source: Miller-Jones, Tetarenko, and Sivakoff, along with colleagues from around the world, are reporting their results in the scientific journal Nature.

Via NRAO



from EarthSky http://bit.ly/2UIFUuw

The End Is Not Near, But If An 'Insect Apocalypse' Ever Happens, How Would We Know?

The End Is Not Near, But If An 'Insect Apocalypse' Ever Happens, How Would We Know?

Insects scuttle, chew and fly through the world around us. Humans rely on them to pollinate plants, prey on insects that we don’t get along with, and to be movers and shakers for Earth’s ecosystems. It’s hard to imagine a world without insects.

That’s why news reports in recent months warning of an “insect apocalypse” sparked widespread alarm. These articles, which were based on long-term insect collections and a review of past studies, suggested that people alive today will witness the indiscriminate extinction of insect-kind.

I study fungi that can be used to control harmful insects, such as pests that damage crops and mosquitoes that transmit malaria. In my world, reports of mass insect die-offs are big news. But while there clearly is reason to be concerned about certain insects, such as the endangered rusty patched bumble bee or the American burying beetle, in my view it isn’t yet possible to predict a looming insect apocalypse.

More than 1 million insects have been discovered and named, but many millions have yet to be described. It’s undeniable that Earth is becoming increasingly inhospitable to some insects – but nightmarish conditions for one may be heaven to another.

Put another way, there is no perfect environment for all insects. And human impacts on the environment, like climate change and land development, very well may hurt beneficial insects and help harmful ones.

Insects account for 75% of all the known species on Earth. What makes them so successful?

Insect declines

Around the world, entomologists are looking wistfully into empty nets, and car owners are increasingly unsettled by their pristine windshields. It does not take decades of data collection and a degree to notice that in a human lifetime, our teeming world teems less.

The first study to set off alarms was published in 2017 by entomologists in Germany, who reported that over 27 years the biomass of flying insects in their traps had declined by 75%. Another study from the Luquillo Long Term Ecological Research program site in the Puerto Rican rainforest reproduced an insect survey from the 1970s. It found that the biomass of arthropods – a large group of organisms that includes insects – had declined 10- to 60-fold in that time, and that lizards, frogs and birds that ate arthropods had also declined.

Underscoring this theme, in April 2019 two scholars published a review that synthesized over 70 reports of insect decline from around the world, and predicted mass insect extinctions within a human lifetime. They took a alarmist tone, and have been widely criticized for exaggerating their conclusions and selecting studies to review with the word “decline.”

Nonetheless, these researchers had no trouble finding studies to include in their review. Many scientists are currently analyzing the roles that climate change, land use, chemical pesticides and other factors have played in reported declines in many insect species.

Taylors checkerspot butterfly

The Taylor’s checkerspot butterfly, once found throughout grasslands in the Pacific Northwest, was listed as endangered in 2013. The main cause is habitat loss, driven by development, tree encroachment and spread of invasive plants. USFWS/Ted Thomas, CC BY

The end is not near

These discussions are important, but they don’t mean an insect apocalypse is under way. Predicting insect decline is hard to do without a lot of effort and data.

To predict an apocalypse, entomologists worldwide will need to conduct careful large-scale studies that involve collecting, identifying and counting many different insects. There are very few insects for which scientists have enough data now to reliably predict how many individuals there will be from year to year, let alone confidently chart a decline in each species. Most of the insects for which this information exists are species that are important for agricultural or human health, such as managed honey bees or mosquitoes.

And human actions are shifting balances between insect species. As an example, the mosquitoes that are best at spreading pathogens that cause disease have evolved to thrive near us. Entomologists call them anthropophilic, which means they love people.

That love extends to human impacts on the land. Insects that flutter from flower to flower won’t be happy when developers bulldoze a meadow and scatter tires around, but human-biting mosquitoes will be buzzing with excitement.

What else is out there?

Entomologists are uniformly concerned about the fate of insects in today’s changing world. But I believe the responsible approach is to push back on fire-and-brimstone rhetoric until detailed, large-scale studies are completed. Until then, these same gaps in our knowledge also make it hard to rule out that significant declines in diverse insects are happening. These gaps must be filled to illuminate challenges that insects face, from the inconvenient to the apocalyptic.

When the majority of insects remain to be described, it’s hard to value them. But here’s one example: Insecticide use in pear groves in China’s Sichuan Province has caused such a decline in native pollinators that beekeepers will not lend their bees to these orchards. These farmers are forced to pollinate their trees by hand – an expensive and time-consuming process if you aren’t an insect.

Similarly, native natural enemies played invisible roles in slowing the spread of the invasive brown marmorated stink bug when it was introduced into Pennsylvania in the 1990s. They included wasps that lay their eggs inside of stink bug eggs, and predatory insects and spiders that eat stink bugs eggs for breakfast.

Pollination and predation are just the start. Some insects could be sources of new drugs or traditional dyes, while others inspire artists or just provide little moments of inimitable beauty.

With so many unanswered questions, it’s clear that there is a need for more funding for biodiversity research. It is no coincidence that recent studies reporting massive insect declines came from a Long-Term Ecological Research center that is publicly funded through the National Science Foundation and from a carefully curated collection made and maintained by entomologists.

This kind of work requires money, bold foresight and dedication to science over long periods of time. But it can produce insights into how our world is changing – and that knowledge will help us prepare for the future.

By Brian Lovett, PhD Candidate, University of Maryland. This article is republished from The Conversation under a Creative Commons license. Read the original article.The ConversationTop image credit: Chris Luczkow, CC BY

The Conversation Mon, 04/29/2019 - 10:19
Categories


from ScienceBlogs - Where the world discusses science http://bit.ly/2VyMmbU
The End Is Not Near, But If An 'Insect Apocalypse' Ever Happens, How Would We Know?

Insects scuttle, chew and fly through the world around us. Humans rely on them to pollinate plants, prey on insects that we don’t get along with, and to be movers and shakers for Earth’s ecosystems. It’s hard to imagine a world without insects.

That’s why news reports in recent months warning of an “insect apocalypse” sparked widespread alarm. These articles, which were based on long-term insect collections and a review of past studies, suggested that people alive today will witness the indiscriminate extinction of insect-kind.

I study fungi that can be used to control harmful insects, such as pests that damage crops and mosquitoes that transmit malaria. In my world, reports of mass insect die-offs are big news. But while there clearly is reason to be concerned about certain insects, such as the endangered rusty patched bumble bee or the American burying beetle, in my view it isn’t yet possible to predict a looming insect apocalypse.

More than 1 million insects have been discovered and named, but many millions have yet to be described. It’s undeniable that Earth is becoming increasingly inhospitable to some insects – but nightmarish conditions for one may be heaven to another.

Put another way, there is no perfect environment for all insects. And human impacts on the environment, like climate change and land development, very well may hurt beneficial insects and help harmful ones.

Insects account for 75% of all the known species on Earth. What makes them so successful?

Insect declines

Around the world, entomologists are looking wistfully into empty nets, and car owners are increasingly unsettled by their pristine windshields. It does not take decades of data collection and a degree to notice that in a human lifetime, our teeming world teems less.

The first study to set off alarms was published in 2017 by entomologists in Germany, who reported that over 27 years the biomass of flying insects in their traps had declined by 75%. Another study from the Luquillo Long Term Ecological Research program site in the Puerto Rican rainforest reproduced an insect survey from the 1970s. It found that the biomass of arthropods – a large group of organisms that includes insects – had declined 10- to 60-fold in that time, and that lizards, frogs and birds that ate arthropods had also declined.

Underscoring this theme, in April 2019 two scholars published a review that synthesized over 70 reports of insect decline from around the world, and predicted mass insect extinctions within a human lifetime. They took a alarmist tone, and have been widely criticized for exaggerating their conclusions and selecting studies to review with the word “decline.”

Nonetheless, these researchers had no trouble finding studies to include in their review. Many scientists are currently analyzing the roles that climate change, land use, chemical pesticides and other factors have played in reported declines in many insect species.

Taylors checkerspot butterfly

The Taylor’s checkerspot butterfly, once found throughout grasslands in the Pacific Northwest, was listed as endangered in 2013. The main cause is habitat loss, driven by development, tree encroachment and spread of invasive plants. USFWS/Ted Thomas, CC BY

The end is not near

These discussions are important, but they don’t mean an insect apocalypse is under way. Predicting insect decline is hard to do without a lot of effort and data.

To predict an apocalypse, entomologists worldwide will need to conduct careful large-scale studies that involve collecting, identifying and counting many different insects. There are very few insects for which scientists have enough data now to reliably predict how many individuals there will be from year to year, let alone confidently chart a decline in each species. Most of the insects for which this information exists are species that are important for agricultural or human health, such as managed honey bees or mosquitoes.

And human actions are shifting balances between insect species. As an example, the mosquitoes that are best at spreading pathogens that cause disease have evolved to thrive near us. Entomologists call them anthropophilic, which means they love people.

That love extends to human impacts on the land. Insects that flutter from flower to flower won’t be happy when developers bulldoze a meadow and scatter tires around, but human-biting mosquitoes will be buzzing with excitement.

What else is out there?

Entomologists are uniformly concerned about the fate of insects in today’s changing world. But I believe the responsible approach is to push back on fire-and-brimstone rhetoric until detailed, large-scale studies are completed. Until then, these same gaps in our knowledge also make it hard to rule out that significant declines in diverse insects are happening. These gaps must be filled to illuminate challenges that insects face, from the inconvenient to the apocalyptic.

When the majority of insects remain to be described, it’s hard to value them. But here’s one example: Insecticide use in pear groves in China’s Sichuan Province has caused such a decline in native pollinators that beekeepers will not lend their bees to these orchards. These farmers are forced to pollinate their trees by hand – an expensive and time-consuming process if you aren’t an insect.

Similarly, native natural enemies played invisible roles in slowing the spread of the invasive brown marmorated stink bug when it was introduced into Pennsylvania in the 1990s. They included wasps that lay their eggs inside of stink bug eggs, and predatory insects and spiders that eat stink bugs eggs for breakfast.

Pollination and predation are just the start. Some insects could be sources of new drugs or traditional dyes, while others inspire artists or just provide little moments of inimitable beauty.

With so many unanswered questions, it’s clear that there is a need for more funding for biodiversity research. It is no coincidence that recent studies reporting massive insect declines came from a Long-Term Ecological Research center that is publicly funded through the National Science Foundation and from a carefully curated collection made and maintained by entomologists.

This kind of work requires money, bold foresight and dedication to science over long periods of time. But it can produce insights into how our world is changing – and that knowledge will help us prepare for the future.

By Brian Lovett, PhD Candidate, University of Maryland. This article is republished from The Conversation under a Creative Commons license. Read the original article.The ConversationTop image credit: Chris Luczkow, CC BY

The Conversation Mon, 04/29/2019 - 10:19
Categories


from ScienceBlogs - Where the world discusses science http://bit.ly/2VyMmbU

You saw the 1st photo of a black hole? Now see its home galaxy

The galaxy M87. An inset shows 2 massive jets.

The 1st direct black hole photo came from a galaxy known as Messier 87. Here’s the galaxy’s image from the Spitzer Space Telescope, an infrared telescope launched in 2003 and still operating as of 2019. You can’t see the hole itself in this image, but you can see 2 massive jets of material (and their aftershocks), ejected from the disk of material rotating around the hole. Image via NASA/JPL-Caltech/IPAC.

Earlier this month, scientists unveiled the first-ever photo taken of a black hole. It was a phenomenal achievement, and that image of the hot, glowing donut-shaped ring of gas and dust – surrounding the black hole itself, which can’t be seen – will go down in history as one of the most epic photos in space science. You can thank the Event Horizon Telescope for this first black hole image; this international group worked for years to accomplish it. Now … want some context for the black hole image? The first several images on this page let us step back a bit, to see how the giant black hole – 6.5 billion times more massive than our sun – appears in relation to its host galaxy, Messier 87 (aka M87). It’s a great view!

NASA released the image above – from its orbiting Spitzer Space Telescope – on April 25, 2019. It shows the black hole’s galaxy in the infrared. Although neither the black hole nor its event horizon can be seen here, you can see two massive jets of material being ejected from the event horizon out into space at nearly the speed of light, just one indication of the power of the central black hole. You thought black holes suck in material with gravity so strong that even light can’t escape? That’s true. But other material can become trapped in the disk around a black hole’s event horizon, and later be ejected again back out into deep space.

M87 is very far away – 55 million light-years away from Earth – and has been studied for over 100 years, including by observatories such as the Hubble Space Telescope, the Chandra X-ray Observatory and NuSTAR. The jets were first seen back in 1918, although their connection to a giant black hole was completely unknown at the time. The jets were first noticed by astronomer Heber Curtis as “a curious straight ray” extending from the center of the galaxy. What was this odd feature?

Galaxy with insets of black hole between 2 jets of ejected material, & of black hole closeup photo.

Another version of the first image, also showing the location of the black hole between the two jets. Image via NASA/JPL-Caltech/IPAC/Event Horizon Telescope. Larger versions of these images, including wallpaper, are available via JPL.

Now, we know that the jets are composed of high-energy material that shoots out of a disk of material that spins rapidly around the black hole. The ejected material moves at incredible speed – almost the speed of light – and can be seen in visible light, infrared light, radio waves and X-rays.

One of the jets is quite prominent, but when the material in it hits the much sparser material in the interstellar medium (the space between the stars of the galaxy), it creates a huge shockwave that is even more visible. The shockwave can only be seen in infrared light and radio waves. This jet is moving almost directly toward Earth, which increases its apparent brightness. We can still see some of the length of the jet, however, since it is slightly offset from our line of sight. At one point, it looks like the jet curves downward a bit; according to scientists, this is where particles in the jet hit gas particles in the interstellar medium and slow down a little.

Glowing orange circle: ring around giant black hole in galaxy M87.

The image that captured people’s imaginations earlier this month – the first real photo of a giant black hole, in the center of galaxy M87. The dark region in the middle isn’t actually the black hole itself, but rather the shadow of the black hole on the bright ring of material. The black hole itself is smaller than the shadow and can’t be seen directly. The bright ring forms as light is bent around the black hole by the intense gravity. Image via Event Horizon Telescope.

The other jet is much fainter, since it is moving away from Earth, and just as fast as the other jet. This makes it virtually invisible in all wavelengths. But as with the first jet, the shockwave – which looks like an inverted letter C – is still clearly visible.

Understanding black holes has been a great challenge for astronomers and physicists over the past few decades, but they’ve been making great strides towards that goal. Once considered to be “exotic,” and still among the strangest objects ever discovered, supermassive black holes are now known to be located in the centers of many (if not most) galaxies, including our own, and an untold number of smaller black holes dot the universe. Studying black holes in the context of their galaxies – and having the ability to image them directly – are major steps towards understanding one of these incredible and bizarre phenomena.

Large fuzzy round galaxy with brilliant center and blue ject coming from it.

Here’s a classic photo of the galaxy M87, from the Hubble Space Telescope. This image is a composite of visible and infrared observations, and shows the galaxy’s prominent blue plasma jet, streaming from the central black hole at nearly the speed of light. Image via NASA.

Closeup of long blue jet narrower at origin and wider farther out.

Close-up on M87’s jet. It stretches 1,500 parsecs (5,000 light-years) from the galaxy’s core. In this Hubble image, the blue jet contrasts with the yellow glow from the combined light of billions of unresolved stars and the point-like clusters of stars that make up this galaxy. Image via Wikimedia Commons.

Star chart showing constellations Virgo and Leo, with M87 between them.

Star chart showing M87 on the sky’s dome, via Stellarium/NASA. This chart represents the view from mid-northern latitudes around 10 p.m. in May. Want to get oriented? Find the stars Arcturus and Spica.

Bottom line: Astronomers have released some new images (first two images on this page) of the galaxy M87, home galaxy to the giant black hole whose image you saw a few weeks ago. The images show you the black hole in the context of its galaxy.

Via Jet Propulsion Laboratory



from EarthSky http://bit.ly/2Vy5cjj
The galaxy M87. An inset shows 2 massive jets.

The 1st direct black hole photo came from a galaxy known as Messier 87. Here’s the galaxy’s image from the Spitzer Space Telescope, an infrared telescope launched in 2003 and still operating as of 2019. You can’t see the hole itself in this image, but you can see 2 massive jets of material (and their aftershocks), ejected from the disk of material rotating around the hole. Image via NASA/JPL-Caltech/IPAC.

Earlier this month, scientists unveiled the first-ever photo taken of a black hole. It was a phenomenal achievement, and that image of the hot, glowing donut-shaped ring of gas and dust – surrounding the black hole itself, which can’t be seen – will go down in history as one of the most epic photos in space science. You can thank the Event Horizon Telescope for this first black hole image; this international group worked for years to accomplish it. Now … want some context for the black hole image? The first several images on this page let us step back a bit, to see how the giant black hole – 6.5 billion times more massive than our sun – appears in relation to its host galaxy, Messier 87 (aka M87). It’s a great view!

NASA released the image above – from its orbiting Spitzer Space Telescope – on April 25, 2019. It shows the black hole’s galaxy in the infrared. Although neither the black hole nor its event horizon can be seen here, you can see two massive jets of material being ejected from the event horizon out into space at nearly the speed of light, just one indication of the power of the central black hole. You thought black holes suck in material with gravity so strong that even light can’t escape? That’s true. But other material can become trapped in the disk around a black hole’s event horizon, and later be ejected again back out into deep space.

M87 is very far away – 55 million light-years away from Earth – and has been studied for over 100 years, including by observatories such as the Hubble Space Telescope, the Chandra X-ray Observatory and NuSTAR. The jets were first seen back in 1918, although their connection to a giant black hole was completely unknown at the time. The jets were first noticed by astronomer Heber Curtis as “a curious straight ray” extending from the center of the galaxy. What was this odd feature?

Galaxy with insets of black hole between 2 jets of ejected material, & of black hole closeup photo.

Another version of the first image, also showing the location of the black hole between the two jets. Image via NASA/JPL-Caltech/IPAC/Event Horizon Telescope. Larger versions of these images, including wallpaper, are available via JPL.

Now, we know that the jets are composed of high-energy material that shoots out of a disk of material that spins rapidly around the black hole. The ejected material moves at incredible speed – almost the speed of light – and can be seen in visible light, infrared light, radio waves and X-rays.

One of the jets is quite prominent, but when the material in it hits the much sparser material in the interstellar medium (the space between the stars of the galaxy), it creates a huge shockwave that is even more visible. The shockwave can only be seen in infrared light and radio waves. This jet is moving almost directly toward Earth, which increases its apparent brightness. We can still see some of the length of the jet, however, since it is slightly offset from our line of sight. At one point, it looks like the jet curves downward a bit; according to scientists, this is where particles in the jet hit gas particles in the interstellar medium and slow down a little.

Glowing orange circle: ring around giant black hole in galaxy M87.

The image that captured people’s imaginations earlier this month – the first real photo of a giant black hole, in the center of galaxy M87. The dark region in the middle isn’t actually the black hole itself, but rather the shadow of the black hole on the bright ring of material. The black hole itself is smaller than the shadow and can’t be seen directly. The bright ring forms as light is bent around the black hole by the intense gravity. Image via Event Horizon Telescope.

The other jet is much fainter, since it is moving away from Earth, and just as fast as the other jet. This makes it virtually invisible in all wavelengths. But as with the first jet, the shockwave – which looks like an inverted letter C – is still clearly visible.

Understanding black holes has been a great challenge for astronomers and physicists over the past few decades, but they’ve been making great strides towards that goal. Once considered to be “exotic,” and still among the strangest objects ever discovered, supermassive black holes are now known to be located in the centers of many (if not most) galaxies, including our own, and an untold number of smaller black holes dot the universe. Studying black holes in the context of their galaxies – and having the ability to image them directly – are major steps towards understanding one of these incredible and bizarre phenomena.

Large fuzzy round galaxy with brilliant center and blue ject coming from it.

Here’s a classic photo of the galaxy M87, from the Hubble Space Telescope. This image is a composite of visible and infrared observations, and shows the galaxy’s prominent blue plasma jet, streaming from the central black hole at nearly the speed of light. Image via NASA.

Closeup of long blue jet narrower at origin and wider farther out.

Close-up on M87’s jet. It stretches 1,500 parsecs (5,000 light-years) from the galaxy’s core. In this Hubble image, the blue jet contrasts with the yellow glow from the combined light of billions of unresolved stars and the point-like clusters of stars that make up this galaxy. Image via Wikimedia Commons.

Star chart showing constellations Virgo and Leo, with M87 between them.

Star chart showing M87 on the sky’s dome, via Stellarium/NASA. This chart represents the view from mid-northern latitudes around 10 p.m. in May. Want to get oriented? Find the stars Arcturus and Spica.

Bottom line: Astronomers have released some new images (first two images on this page) of the galaxy M87, home galaxy to the giant black hole whose image you saw a few weeks ago. The images show you the black hole in the context of its galaxy.

Via Jet Propulsion Laboratory



from EarthSky http://bit.ly/2Vy5cjj

All you need to know: Eta Aquariid meteors

Many radial streaks indicating meteor pathways.

The 2013 Eta Aquariid meteor shower was fantastic as viewed from Earth’s Southern Hemisphere. Colin Legg of Australia created this composite of his experience. He wrote, “Composite of approximately 50 images containing 26 meteors, meteor train, 17% moon, zodiacal light and Pilbara desert.”

In 2019, the forecast calls for the greatest number of Eta Aquariid meteors to fall before dawn on (or near) May 5. However, this shower has a rather broad maximum, so the day before or after may be just as good. Fortunately, the new moon on May 4 will provide inky black skies for this year’s Eta Aquariid meteor shower. This shower favors the Southern Hemisphere, ranking as one of the finest showers of the year – in a year when no moon obscures the show. At mid-northern latitudes, these meteors don’t fall so abundantly – and the early morning twilight interferes at northerly latitudes.

Why more Eta Aquariid meteors in the Southern Hemisphere?

Halley’s Comet is the source of the Eta Aquariid meteor shower.

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Bright meteor streak above misty valley in crater of mountain.

Meteor captured over Mount Bromo, an active volcano in Indonesia, during the 2013 Eta Aquariid shower. Photo by Justin Ng of Singapore. See more photos by Justin Ng.

When and how should I watch the Eta Aquariids? The 2019 Eta Aquariid meteor shower is expected to produce the greatest number of meteors in the wee hours before dawn on May 5. However, the broad peak of the Eta Aquariid shower may present a decent showing of meteors during the predawn hours on May 4 and May 6, too. And in fact the shower extends much beyond these dates on either side. Writing for the International Meteor Organization on May 1, 2017, Robert Lunsford pointed out:

… There is no sharp peak for this shower, but rather a plateau of good rates that last approximately one week centered on May 6.

In general, the best time to watch these fast and often bright meteors is in the early morning hours, before the onset of morning twilight. Don’t know when twilight begins in your part of the world? Try this link and remember to check the astronomical twilight box.

Give yourself at least an hour of viewing time for watching any meteor shower. Meteors tend to come in spurts that are interspersed by lulls. Also, it can take as long as 20 minutes for your eyes to adapt to the dark.

You need no special equipment to watch a meteor shower, but a little luck always helps. Meteor watching is a lot like fishing. Sometimes you catch a good number of them and sometimes you don’t.

Sky chart of radiant point of Eta Aquarid meteor shower in the constellation Aquarius.

Radiant point of Eta Aquariid meteor shower. It’s in the constellation Aquarius, in the southeast before dawn on May mornings, as seen from mid-northern latitudes.

Sky chart of constellation Aquarius with Water Jar marked.

A Y-shaped asterism called the Water Jar marks the radiant of the Eta Aquariid meteor shower. It’s noticeable, if your sky is dark.

Radiant point of the Eta Aquariid shower. If you trace the paths of the Eta Aquariid meteors backward, they all seem to radiate from a certain point in front of the constellation Aquarius the Water Bearer. This point on the sky’s dome is called the radiant of the meteor shower, which nearly aligns with the faint star Eta Aquarii. Hence, this meteor shower is named in honor of this star.

Eta Aquarii is one of the four stars making up the Y-shaped Water Jar asterism in the northern part of Aquarius. If you can find the Water Jar in the constellation Aquarius, you’ve as good as located the radiant point for the Eta Aquariid meteors. The alignment of the radiant and the star is of course coincidental. Eta Aquarii is some 170 light-years away – trillons upon trillions of miles away – while the Eta Aquariid meteors burn up about 60 miles (100 km) above Earth’s surface.

Meteor shower radiants are sometimes misunderstood by casual meteor-watchers. You don’t need to know where they are to watch a meteor shower. That’s because the meteors fly every which way across the sky, in front of numerous constellations. However, the higher a shower’s radiant appears in your sky, the more meteors you’re likely to see. For the Eta Aquariids, the radiant soars highest in the nighttime sky just before dawn. That’s why you can expect to see the most meteors in the wee morning hours.

You can see some Eta Aquariid meteors in late evening, before the radiant rises into your sky. In fact, late evening is the best time to see earthgrazers, meteors that make exceptionally long streaks across your sky. As the radiant rises higher – that is, as the hours of the night tick away to dawn – you’ll see shorter meteors, but more meteors.

No special equipment is needed to watch a meteor shower. Find a dark, open sky away from artificial lights, and sprawl out on a reclining lawn chair.

How many meteors should I expect to see? In a dark sky, especially at more southerly latitudes, the Eta Aquariids can produce up to 20 to 40 meteors per hour. From mid-northern latitudes, you might only see about 10 meteors per hour.

Comet, bright head and cone-shaped tail against star field.

Halley’s Comet, the parent of the May Eta Aquariid and October Orionid meteor showers. Image vuia NASA Blueshift. Dust from this comet will streak the nighttime as Eta Aquariid meteors on the mornings of May 5 and 6.

Halley’s Comet is the source of the Eta Aquariid meteor shower. Every year, our planet Earth crosses the orbital path of Halley’s Comet in late April and May, so bits and pieces from this comet light up the nighttime as Eta Aquariid meteors. This shower is said to be active from April 19 to May 20, although Earth plows most deeply into this stream of comet debris around May 5 or 6.

The comet dust smashes into Earth’s upper atmosphere at nearly 150,000 miles per hour (240,000 kilometers per hour). Roughly half of these swift-moving meteors leave persistent trains – ionized gas trails that glow for a few seconds after the meteor has passed.

Our planet also crosses the orbital path of Halley’s Comet at the other end of the year, giving rise to the Orionid meteor shower, which is usually at its best in the predawn hours on or near October 21.

Bottom line: What’s a good meteor shower for the Southern Hemisphere? It’s usually the Eta Aquariid shower on the mornings of May 5 and 6. This year, 2019, the new moon on May 4 guarantees dark skies for this year’s presentation.

EarthSky’s meteor shower guide for 2019



from EarthSky http://bit.ly/1pRgiL8
Many radial streaks indicating meteor pathways.

The 2013 Eta Aquariid meteor shower was fantastic as viewed from Earth’s Southern Hemisphere. Colin Legg of Australia created this composite of his experience. He wrote, “Composite of approximately 50 images containing 26 meteors, meteor train, 17% moon, zodiacal light and Pilbara desert.”

In 2019, the forecast calls for the greatest number of Eta Aquariid meteors to fall before dawn on (or near) May 5. However, this shower has a rather broad maximum, so the day before or after may be just as good. Fortunately, the new moon on May 4 will provide inky black skies for this year’s Eta Aquariid meteor shower. This shower favors the Southern Hemisphere, ranking as one of the finest showers of the year – in a year when no moon obscures the show. At mid-northern latitudes, these meteors don’t fall so abundantly – and the early morning twilight interferes at northerly latitudes.

Why more Eta Aquariid meteors in the Southern Hemisphere?

Halley’s Comet is the source of the Eta Aquariid meteor shower.

Enjoying EarthSky so far? Sign up for our free daily newsletter today!

Bright meteor streak above misty valley in crater of mountain.

Meteor captured over Mount Bromo, an active volcano in Indonesia, during the 2013 Eta Aquariid shower. Photo by Justin Ng of Singapore. See more photos by Justin Ng.

When and how should I watch the Eta Aquariids? The 2019 Eta Aquariid meteor shower is expected to produce the greatest number of meteors in the wee hours before dawn on May 5. However, the broad peak of the Eta Aquariid shower may present a decent showing of meteors during the predawn hours on May 4 and May 6, too. And in fact the shower extends much beyond these dates on either side. Writing for the International Meteor Organization on May 1, 2017, Robert Lunsford pointed out:

… There is no sharp peak for this shower, but rather a plateau of good rates that last approximately one week centered on May 6.

In general, the best time to watch these fast and often bright meteors is in the early morning hours, before the onset of morning twilight. Don’t know when twilight begins in your part of the world? Try this link and remember to check the astronomical twilight box.

Give yourself at least an hour of viewing time for watching any meteor shower. Meteors tend to come in spurts that are interspersed by lulls. Also, it can take as long as 20 minutes for your eyes to adapt to the dark.

You need no special equipment to watch a meteor shower, but a little luck always helps. Meteor watching is a lot like fishing. Sometimes you catch a good number of them and sometimes you don’t.

Sky chart of radiant point of Eta Aquarid meteor shower in the constellation Aquarius.

Radiant point of Eta Aquariid meteor shower. It’s in the constellation Aquarius, in the southeast before dawn on May mornings, as seen from mid-northern latitudes.

Sky chart of constellation Aquarius with Water Jar marked.

A Y-shaped asterism called the Water Jar marks the radiant of the Eta Aquariid meteor shower. It’s noticeable, if your sky is dark.

Radiant point of the Eta Aquariid shower. If you trace the paths of the Eta Aquariid meteors backward, they all seem to radiate from a certain point in front of the constellation Aquarius the Water Bearer. This point on the sky’s dome is called the radiant of the meteor shower, which nearly aligns with the faint star Eta Aquarii. Hence, this meteor shower is named in honor of this star.

Eta Aquarii is one of the four stars making up the Y-shaped Water Jar asterism in the northern part of Aquarius. If you can find the Water Jar in the constellation Aquarius, you’ve as good as located the radiant point for the Eta Aquariid meteors. The alignment of the radiant and the star is of course coincidental. Eta Aquarii is some 170 light-years away – trillons upon trillions of miles away – while the Eta Aquariid meteors burn up about 60 miles (100 km) above Earth’s surface.

Meteor shower radiants are sometimes misunderstood by casual meteor-watchers. You don’t need to know where they are to watch a meteor shower. That’s because the meteors fly every which way across the sky, in front of numerous constellations. However, the higher a shower’s radiant appears in your sky, the more meteors you’re likely to see. For the Eta Aquariids, the radiant soars highest in the nighttime sky just before dawn. That’s why you can expect to see the most meteors in the wee morning hours.

You can see some Eta Aquariid meteors in late evening, before the radiant rises into your sky. In fact, late evening is the best time to see earthgrazers, meteors that make exceptionally long streaks across your sky. As the radiant rises higher – that is, as the hours of the night tick away to dawn – you’ll see shorter meteors, but more meteors.

No special equipment is needed to watch a meteor shower. Find a dark, open sky away from artificial lights, and sprawl out on a reclining lawn chair.

How many meteors should I expect to see? In a dark sky, especially at more southerly latitudes, the Eta Aquariids can produce up to 20 to 40 meteors per hour. From mid-northern latitudes, you might only see about 10 meteors per hour.

Comet, bright head and cone-shaped tail against star field.

Halley’s Comet, the parent of the May Eta Aquariid and October Orionid meteor showers. Image vuia NASA Blueshift. Dust from this comet will streak the nighttime as Eta Aquariid meteors on the mornings of May 5 and 6.

Halley’s Comet is the source of the Eta Aquariid meteor shower. Every year, our planet Earth crosses the orbital path of Halley’s Comet in late April and May, so bits and pieces from this comet light up the nighttime as Eta Aquariid meteors. This shower is said to be active from April 19 to May 20, although Earth plows most deeply into this stream of comet debris around May 5 or 6.

The comet dust smashes into Earth’s upper atmosphere at nearly 150,000 miles per hour (240,000 kilometers per hour). Roughly half of these swift-moving meteors leave persistent trains – ionized gas trails that glow for a few seconds after the meteor has passed.

Our planet also crosses the orbital path of Halley’s Comet at the other end of the year, giving rise to the Orionid meteor shower, which is usually at its best in the predawn hours on or near October 21.

Bottom line: What’s a good meteor shower for the Southern Hemisphere? It’s usually the Eta Aquariid shower on the mornings of May 5 and 6. This year, 2019, the new moon on May 4 guarantees dark skies for this year’s presentation.

EarthSky’s meteor shower guide for 2019



from EarthSky http://bit.ly/1pRgiL8

What’s on the far side of the moon?

Back of gibbous moon with large Earth behind it.

The far side looks a lot like the near side. Image via NASA’s Scientific Visualization Studio.

By Wayne Schlingman, The Ohio State University

Looking up at the silvery orb of the moon, you might recognize familiar shadows and shapes on its face from one night to the next. You see the same view of the moon our early ancestors did as it lighted their way after sundown.

Only one side of the spherical moon is ever visible from Earth – it wasn’t until 1959 when the Soviet Spacecraft Luna 3 orbited the moon and sent pictures home that human beings were able to see the “far side” of the moon for the first time.

Two panels: left side very fuzzy image of back side of moon, right side clear image.

Comparison of humanity’s first glimpse of the lunar far side and the same view thanks to LRO data 50 years later. Image via NASA’s Goddard Space Flight Center Scientific Visualization Studio

A phenomenon called tidal locking is responsible for the consistent view. The Earth and its moon are in close proximity and thus exert significant gravitational forces on each other. These tidal forces slow the rotations of both bodies. They locked the moon’s rotation in sync with its orbital period relatively soon after it formed – as a product of a collision between a Mars-sized object and the proto-Earth, 100 million years after the solar system coalesced.


The moon’s orbital period and rotational period are the same length of time.

Now the moon takes one trip around the Earth in the same amount of time it takes to make one rotation around its own axis: about 28 days. From Earth, we always see the same face of the moon; from the moon, the Earth stands still in the sky.

The near side of the moon is well studied because we can see it. The astronauts landed on the near side of the moon so they could communicate with NASA here on Earth. All of the samples from the Apollo missions are from the near side.

Astronaut on ladder from gold foil covered lunar module, moon horizon and black sky in background.

Buzz Aldrin descends from the lunar module to the surface of the moon on July 20, 1969. Image via NASA.

Although the far side of the moon isn’t visible from our vantage point, and with all due respect to Pink Floyd, it is not accurate to call it the dark side of the moon. All sides of the moon experience night and day just like we do here on Earth. All sides have equal amounts of day and night over the course of a single month. A lunar day lasts about two Earth weeks.

With modern satellites, astronomers have completely mapped the lunar surface. A Chinese mission, Chang’e 4, is currently exploring the Aitken Basin on the far side of the moon — the first such mission ever landed there. Researchers hope Chang’e 4 will help answer questions about the crater’s surface features and test whether things can grow in lunar soil. A privately funded Israeli mission, Beresheet, started as a mission to compete for the Google Lunar X Prize. Despite crashing during an attempted landing earlier this month, the Beresheet team still won the Moon Shot Award.

Being shielded from civilization means the far side of the moon is “radio dark.” There, researchers can measure weak signals from the universe that would otherwise be drowned out. Chang’e 4, for instance, will be able to observe low-frequency radio light coming from the sun or beyond that’s impossible to detect here on the Earth due to human activity, such as TV and radio broadcasts and other forms of communication signals. Low-frequency radio peers back in time to the very first stars and the very first black holes, giving astronomers a greater understanding of how the structures of the universe began forming.

Moon landscape with mountains on horizon and craters closer to observer.

Arrows indicate position of Chang’e 4 lander on the floor of the moon’s Von Kármán crater. The sharp crater behind and to the left of the landing site is 12,800 feet (3,900 meters) across and 1,970 feet (600 meters) deep. Image via NASA/GSFC/Arizona State University.

Rover missions also investigate all sides of the moon as space scientists prepare for future human missions, looking to the moon’s resources to help humanity get to Mars. For instance, water – discovered by NASA’s LCROSS satellite beneath the moon’s north and south poles in 2009 – can be broken up into hydrogen and oxygen and used for fuel and breathing.

Researchers are getting closer to exploring the moon’s polar craters, some of which have never seen the light of day – literally. They are deep and in just the right place to never have the sun shine onto the crater floor. There are certainly dark parts of the moon, but the whole far side isn’t one of them.

Wayne Schlingman, Director of the Arne Slettebak Planetarium, The Ohio State University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Bottom line: What is on the far side of the moon?

The Conversation



from EarthSky http://bit.ly/2Lethb8
Back of gibbous moon with large Earth behind it.

The far side looks a lot like the near side. Image via NASA’s Scientific Visualization Studio.

By Wayne Schlingman, The Ohio State University

Looking up at the silvery orb of the moon, you might recognize familiar shadows and shapes on its face from one night to the next. You see the same view of the moon our early ancestors did as it lighted their way after sundown.

Only one side of the spherical moon is ever visible from Earth – it wasn’t until 1959 when the Soviet Spacecraft Luna 3 orbited the moon and sent pictures home that human beings were able to see the “far side” of the moon for the first time.

Two panels: left side very fuzzy image of back side of moon, right side clear image.

Comparison of humanity’s first glimpse of the lunar far side and the same view thanks to LRO data 50 years later. Image via NASA’s Goddard Space Flight Center Scientific Visualization Studio

A phenomenon called tidal locking is responsible for the consistent view. The Earth and its moon are in close proximity and thus exert significant gravitational forces on each other. These tidal forces slow the rotations of both bodies. They locked the moon’s rotation in sync with its orbital period relatively soon after it formed – as a product of a collision between a Mars-sized object and the proto-Earth, 100 million years after the solar system coalesced.


The moon’s orbital period and rotational period are the same length of time.

Now the moon takes one trip around the Earth in the same amount of time it takes to make one rotation around its own axis: about 28 days. From Earth, we always see the same face of the moon; from the moon, the Earth stands still in the sky.

The near side of the moon is well studied because we can see it. The astronauts landed on the near side of the moon so they could communicate with NASA here on Earth. All of the samples from the Apollo missions are from the near side.

Astronaut on ladder from gold foil covered lunar module, moon horizon and black sky in background.

Buzz Aldrin descends from the lunar module to the surface of the moon on July 20, 1969. Image via NASA.

Although the far side of the moon isn’t visible from our vantage point, and with all due respect to Pink Floyd, it is not accurate to call it the dark side of the moon. All sides of the moon experience night and day just like we do here on Earth. All sides have equal amounts of day and night over the course of a single month. A lunar day lasts about two Earth weeks.

With modern satellites, astronomers have completely mapped the lunar surface. A Chinese mission, Chang’e 4, is currently exploring the Aitken Basin on the far side of the moon — the first such mission ever landed there. Researchers hope Chang’e 4 will help answer questions about the crater’s surface features and test whether things can grow in lunar soil. A privately funded Israeli mission, Beresheet, started as a mission to compete for the Google Lunar X Prize. Despite crashing during an attempted landing earlier this month, the Beresheet team still won the Moon Shot Award.

Being shielded from civilization means the far side of the moon is “radio dark.” There, researchers can measure weak signals from the universe that would otherwise be drowned out. Chang’e 4, for instance, will be able to observe low-frequency radio light coming from the sun or beyond that’s impossible to detect here on the Earth due to human activity, such as TV and radio broadcasts and other forms of communication signals. Low-frequency radio peers back in time to the very first stars and the very first black holes, giving astronomers a greater understanding of how the structures of the universe began forming.

Moon landscape with mountains on horizon and craters closer to observer.

Arrows indicate position of Chang’e 4 lander on the floor of the moon’s Von Kármán crater. The sharp crater behind and to the left of the landing site is 12,800 feet (3,900 meters) across and 1,970 feet (600 meters) deep. Image via NASA/GSFC/Arizona State University.

Rover missions also investigate all sides of the moon as space scientists prepare for future human missions, looking to the moon’s resources to help humanity get to Mars. For instance, water – discovered by NASA’s LCROSS satellite beneath the moon’s north and south poles in 2009 – can be broken up into hydrogen and oxygen and used for fuel and breathing.

Researchers are getting closer to exploring the moon’s polar craters, some of which have never seen the light of day – literally. They are deep and in just the right place to never have the sun shine onto the crater floor. There are certainly dark parts of the moon, but the whole far side isn’t one of them.

Wayne Schlingman, Director of the Arne Slettebak Planetarium, The Ohio State University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Bottom line: What is on the far side of the moon?

The Conversation



from EarthSky http://bit.ly/2Lethb8

Rebellious Times

The Extinction Rebellion protests of 2019 and their naysayers: analysis

It can sometimes seem a lonely road to walk. Voices in the wilderness: a plucky band of writers doing their best to explain the science of climate change, anxiously watching as the countdown-clock ticks away. Producing carefully-written, fully-referenced content, only to watch people turn over and go back to sleep. Facing condemnation, derision, ridicule, from those to whom any notion of deviation from Business as Usual is anathema. Yes, the lot of the climate change campaigner has indeed felt like a lonely road at times. But not any more.

Something extraordinary has happened. People have woken up. It reminds me in a sense of the closing chapters of Tolkein's Lord of the Rings, in which the consistently laid-back and predictably passive hobbits suddenly arise en-masse, to put a swift end to Saruman's occupation and wanton destruction of The Shire. In Tolkein's narrative, the hobbits have to fight a battle, sacrificing some of their own in the process of securing a better future for their people. It was how things tended to be done in Middle Earth.

Switch to the UK in April 2019 and it's not swords and shields but locks, glue, dance and song. The extraordinary protests by the new group, Extinction Rebellion, have brought not only climate breakdown into the limelight, but also biodiversity-loss, pollution and the myth that you can have infinite growth on a finite planet. Over the same period, vast numbers of schoolchildren have undertaken strikes and organised their own demonstrations. Swedish student Greta Thunberg has admonished administration after administration on her tour of European capital cities. Bank of England Governor, Mark Carney, starkly warned companies that if they don’t adjust to the reality of global warming, they will simply cease to exist. To top all of that off, David Attenborough delivered his bluntest warnings to date in a lengthy and compelling documentary - “Climate change: the facts”. In the light of all these developments, it almost feels as if I can put my feet up!

Of course, neither I nor we will put our feet up: if you don't hear from some Team-SkS members for a while, you can guarantee they are still busy on things climate-related, in various other ways. We know there will always be political opposition to climate science; the usual suspects will not stop peddling their contrarian talking-points and they will not go unopposed.

Misinformation-creep

In fact, a classic and well-documented example of misinformation-creep has happened in London, this past weekend. Marble Arch, one of the four key locations across London that has been occupied by Extinction Rebellion, is situated adjacent to Hyde Park. On April 20th, crowds gathered in Hyde Park to celebrate 4/20 Day, an annual occasion about which you can easily find out plenty, by looking it up using an internet search engine. A lot of litter resulted. This is not the first year in which 4/20 parties and litter have been mentioned together in the news. So what happened next? Can you guess?

Photos of the littered park were quickly circulated on social media, with captions like, “so this is what eco-warriors really think of the environment” and so on - see a typical screengrab from Facebook, below. Such things get circulated because too few people bother to fact-check. People don't fact-check either because they don't know how to, or because the story fits their narrative, an extremely narrow, evidence-free narrative in which climate protestors can only be equated with crusty hippies. Therefore there will be litter. And look! A photo of litter! QED!

aftermath of party in Hyde Park

Through such factors, things like this piece of fake-news can spread like wildfire. For example, on April 24th, the Facebook page of Wales Online had a story about an Extinction Rebellion protest in Cardiff. Within less than 24 hours, 159 comment-threads had been posted beneath the piece. On April 25th, I scrolled down through the first 100 original posts. Some 25% of them linked Extinction Rebellion with the litter in Hyde Park - although in fairness most such posts were debunked by others. But the whole business is a textbook example of how easily and rapidly a barefaced lie can spread around, in this Internet era.

The litter fake-narrative is, for once, straightforward to debunk. Furthermore,  Extinction Rebellion, who have been carefully recycling any rubbish, actually volunteered to help local council workers, sent to the park to tidy up the litter. But such silly attempts at smearing led to me asking a bigger question: what are the key objections to Extinction Rebellion and how do they rank, relative to one another? I thought this exercise would offer us a useful snapshot, since in some cases it may help to shape the way we talk to various people about climate change. Not in all cases, of course. Hence this recent tweet from George Monbiot:

If you are middle class, they call you a champagne socialist.
If you are working class, they say it's the politics of envy.
If you wear leather shoes, they call you a hypocrite.
If you don't, they call you a hippy.
Everyone, apparently, is disqualified from challenging the system.

Method

To take the pulse of anti-Extinction Rebellion sentiment, a five-page Daily Mail comments-thread was examined. The article above the line was by Dominic Lawson, it placed Extinction Rebellion in a negative light (what else would anybody expect from the Mail?) and it generated hundreds of comments. Original posts and immediate responses were scrolled through – these being assumed to be posted by those with an axe to grind, since they had taken the trouble to set out their thoughts. A total of 208 comments that demonstrably objected to Extinction Rebellion were copied and pasted into a text document. The comments were then numbered and ranked into ten categories using a spreadsheet and the rankings were then plotted into a pie-chart.

It should be noted, by the way, that many such comments received strong rebuttals from other readers, but what is not known is whether the latter were Daily Mail regulars.

Results

Here's the chart:

pie-chart: types of objection to Extinction Rebellion

Let's take a look at the categories of objection, in order of popularity.

Generic fury against the left: 21.63% of comments

The Daily Mail appeals to those who lean politically to the right, so it comes as no surprise to find a lot of comments either specifically berating the protestors as “leftists” or “lefties” or advocating the police use water-cannon, batons and various other forms of authoritarian physical control on them.

Despite the fact that the laws of physics are apolitical, communicating climate change to right-leaning people has long been one of the greatest challenges faced by the scientific community. One reason is that right-wingers tend to be instinctively opposed to big government, and issues like climate change appear to be so massive that, so the logic goes, only massive governmental controls can adequately deal with the problem. Yet Conservatism itself is deeply rooted in the preservation of things. It is conservative to want to see biodiversity preserved for future generations to enjoy.

To address this contradiction in terms, there is an important point that must be taken into account. There is a difference between old-fashioned Conservatism and the current rapacious system that is largely responsible for the crisis we find ourselves in – Neoliberalism.

Neoliberalism is an extremist form of modern capitalist philosophy in which things only have worth if profit can be extracted from them. That includes us, folks. Neoliberalism first took root in Western economies some forty years ago and, while it has made a small number of people very wealthy, it has also impoverished millions and brought about a rate of biodiversity-loss equivalent to the great mass-extinctions dotted though the fossil record.

Neoliberalism calls for deregulation like no other philosophy – indeed it loves the sort of deregulated free-for-all that brought about the great banking-crash of 2008. As such, it can be argued that Neoliberalism is not Conservative at all, but is instead a pestilence that has by stealth managed to parasitise modern politics. As such, it is not just a problem for the Conservatives, but for all of us.

China syndrome: 18.27% of comments

The second commonest objection to Extinction Rebellion, it goes something like this: “what is the point of doing anything, when countries like China are causing so much pollution?” A similar kind of argument cites over-population, making up nearly a third of comments within this category. This is defeatism at its worst – as a commentator pointed out at the Guardian, it is akin to saying, "that guy is crapping on the floor, so why should I use the toilet?" Another commentator at the Guardian, on overpopulation, made the very important point:

“Population, as others have pointed out, is solving itself. The problem is not the final billion before we stabilise. It's the three or four billion who each want five or ten times as much stuff.“

Consumerism and Neoliberalism, of course, go hand-in-hand: one could not exist without the other. Here's where we can make a huge difference, by simply consuming a lot less stuff. Although Western countries like the UK have offset a lot of their carbon footprint by outsourcing the manufacture of stuff to countries like China, that offset could be instead become an eradication. If people stop buying the stuff in the first place, less of it will be made, equating to less emissions and less pollution. In any case, the Chinese are making considerable progress of their own, as reported in March in the Guardian.

Climate change denial 13.94% of comments

For a sample of 200+ comments in a newspaper that has constantly pushed climate change denial over several decades, such a percentage is at least encouraging. Outright denial of climate science is something that is perceivably on the wane here in the UK, although it has not by any means gone away. As events unfold, denial becomes an increasingly outlandish stance to take, in the face of so much accumulating hard evidence. This is, of course, no reason for complacency on our part.

Accusations of techno-hypocrisy: 13.46% of comments

This objection asserts that, since the protestors used powered travel to get to London and they have things like mobile phones, they are therefore hypocrites. Given that proposed solutions to climate breakdown tend to advocate vastly expanded availability and use of public transport, which is the best means by far of getting to London, the accusation itself has a ring of hypocrisy to it. Also, people need to remember that, while the protestors are advocating systemic change to avoid a nightmare scenario, they are compelled to do so within the system as it currently stands.

Inverse snobbery: 11.54% of comments

Banging away on their stereotypewriters, a substantial number of commentators stated that only middle-class people can afford the luxury of being able to protest. Looking back through the history of protest, it is clear that people of all backgrounds and classes have taken part – I think of the Jarrow Marchers of the 1930s, CND, anti-apartheid and many other examples. In the case of Extinction Rebellion, it is true that it arose through an academic background in 2018, but that does not mean that the movement is elitist: it regards itself as a broad church, open to all who share the same concerns – concerns which are not the sole domain of any one demographic in society.

But things get somewhat cloudier when you look at what some of the anti-Extinction Rebellion cheerleaders are actually saying. Witness this exchange between Tory MP David Davies and radio-journalist Shelagh Fogarty, on LBC. The MP told Fogarty that the protesters were "only able to take days off work because...we have the ability to pay people benefits because we have a capitalist system".

Fogarty replied: "You're making an assumption about people being on benefits are you?" Davies: "I am making an assumption about them yes, but I think it's probably a fair assumption...I'm not saying they're all on benefits but I'll bet you most of them aren't doing a normal 9 to 5 day's work." The MP continued: "Hundreds of thousands of ordinary people's lives are being disrupted, quite unfairly, by a smallest minority of arrogant, middle-class protesters."

Some of what Davies said falls into the next category. But it reminds one of the contradictory accusation sometimes levelled at immigrant people, who, “come over here and take our jobs and benefits” – both at the same time! Talking of benefits, Davies shows how out of touch with reality he is. A week's unemployment allowance, in the UK as things currently stand, would not even buy you a return train-ticket from Leeds to London. And in any case, if Davies really wants to learn what major disruption looks like, he should read up on the science (many days worth on here alone, David), and understand what the planet has in store for us, if we carry on like this for much longer. He certainly needs to look this stuff up, given another comment he made during the same exchange, revealing his somewhat limited grasp of the subject:

A rise of less than one degree, partly due to the end of the little ice age, doesn’t mean we should ban cars, flying & everything else which makes 21st century so great to live in.

Job/benefit envy: 8.17% of comments

“Some of us have to work”, is always going to crop up in such discussions. The concept, bereft of a shred of evidence, is that the protestors are all workless dole-scroungers. Classifying them so allows them to be “othered” - i.e. they do not belong to our tribe - and as such are fair game for other forms of attack. That many Extinction Rebellion protestors are professionals – academics, doctors, lawyers and so on – using their annual leave in order to attend, kind of collides head-on with this particular objection.

Another important point here is that the sort of “business as usual” alluded to, by David Davies above, is exactly the problem. “Normal” is the cause of the biodiversity crisis – the never-ending cycle of travel-work-consume-as-much-as-you-can, repeated day in, day out, by countless millions of people. Or, as put by McEver Dugan and Evan Cholerton (Guardian, 24th April 2019):

Every day we go into work and spend our time and labour building a system that is burning us alive. The top polluters in the world are directly dependent on this effort.

This cycle may well be, “all we know”, but it is most certainly not, “all that is possible”.

Unclassifiable: 7.21% of comments

These are objections that were posted devoid of context, for example a comment that just says, “idiots”. To which, the obvious question is, “why?”.

The Great Unwashed: 3.85% of comments

This category could probably be lumped together with “generic fury against the left”. It completely ignores the demographics of the protestors, opting instead for silly phrases like, “soap-dodgers” and so on. Again, the idea is to “other” the protestors, set them apart from the tribe, yet again it is not based on a shred of evidence.

Conspiracy theories: 1.44% of comments

Only a few of these, advancing ideas such as the protestors being secretly funded by shadowy billionaires or even that the protest is a “false flag” event. There have always been conspiracy theorists. It seems that, for some, reality is never interesting enough.

Publicity-aversion: 0.48% of comments

A minority of objections, too. The idea is that if you ignore these people, then they will go away. File under, “wishful thinking”.

Extinction Rebellion in London, Easter 2019

Above: Extinction Rebellion in London, Easter 2019. The pink boat, used as a focal point and stage, is named the 'Berta Caceres' after the prominent Honduran environmental activist, assassinated in 2016. Image: Fernando García Vicario, via Katy Fowler. A good selection of photographs from the Extinction Rebellion Easter protests can be viewed here.

Looking forward

So there you have it. There are clearly some people that one cannot reason with. But importantly, there are points arising from the results of this brief analysis that may be worthy of further consideration, when engaging with people about climate. The difference between traditional Conservatism and Neoliberalism is perhaps the most important example. Cutting down through the chilling Neoliberal psychology that underpins far too much policy-making today, into the underlying wish to preserve desirable things, like Nature, may help bring a further turn-around.

I'm not a member of Extinction Rebellion, since one can only spread butter so thinly and writing for Skeptical Science and, in more recent years, for some other projects, has been my thing. But I support their aims. So I thought I'd ask a local friend and Extinction Rebellion stalwart, Katy Fowler, to offer her thoughts on some of the objections raised by the opposition. Katy spent several days down in London, so if anybody understands the demographics of the group, she does:

"I spent three amazing days at Oxford Circus, stewarding at the welcome desk. During that time I spoke to hundreds of people, from all walks of life. About half were People of Colour and about a quarter were tourists or visitors. All bar five were curious, positive or downright enthusiastic and delighted. Most had never heard of Extinction Rebellion before.

The five that were less supportive included: one who believed in climate change but didn't think we could make a difference; one young lad who couldn't understand why there was a carnival atmosphere, one (drunk) man who came to shout at us about China and didn't want to listen to our responses (in the end the police stepped in and he ranted at them for five minutes and left); and two separate passers-by who said things along the lines of, "you only want to cause chaos" (a line from an editorial in the Evening Standard that day) and that we were useless hypocrites.
When our food tent was taken down and moved to Marble Arch on Wednesday morning, people were coming up to the desk regularly, asking if they could buy food to donate. Our free food table was constantly full. We also had so many requests if we were taking donations that we put a pot out and received hundreds of pounds. One older Asian gentleman gave us a £50 note!
People were often very emphatic in their gratitude that something big was finally happening. We trained hundreds of people in Non Violent Direct Action. Took hundreds of sign up sheets. Transformed a polluted shrine to consumerism into a people-friendly festival of life, hope and peaceful rebellion."

Extinction Rebellion have made three key demands, The first was for the government to tell the truth by declaring a climate and ecological emergency and working with other institutions to communicate the urgency for change. The second was to halt biodiversity loss and reduce greenhouse gas emissions to net zero by 2025: a very ambitious time-scale maybe, but the need for change is nevertheless urgent. Thirdly, that the government must create and be led by the decisions of a Citizens’ Assembly on climate and ecological justice. As someone with a long involvement in the climate debate, I would also have a fourth demand: tell them how the Goddam Planet works.

By this, I mean that if, “how the planet works”, had been a compulsory part of our National Curriculum, and its predecessors, in schools from the 1950s onwards, there would have been no need for Extinction Rebellion. The planet is our only home, but outside of the Earth Science community, detailed knowledge of the development of life on Earth and what sustains it – and what has come close to wiping it out, is not commonplace. It's as if Planet Earth has been an irrelevance for all these years. Yet the basic principles could easily be taught at a secondary school level, alongside the more traditional physics, chemistry and biology. It would mean far more people would be better-equipped to help maintain a living planet: what's not to like about that?



from Skeptical Science http://bit.ly/2L9IQRg

The Extinction Rebellion protests of 2019 and their naysayers: analysis

It can sometimes seem a lonely road to walk. Voices in the wilderness: a plucky band of writers doing their best to explain the science of climate change, anxiously watching as the countdown-clock ticks away. Producing carefully-written, fully-referenced content, only to watch people turn over and go back to sleep. Facing condemnation, derision, ridicule, from those to whom any notion of deviation from Business as Usual is anathema. Yes, the lot of the climate change campaigner has indeed felt like a lonely road at times. But not any more.

Something extraordinary has happened. People have woken up. It reminds me in a sense of the closing chapters of Tolkein's Lord of the Rings, in which the consistently laid-back and predictably passive hobbits suddenly arise en-masse, to put a swift end to Saruman's occupation and wanton destruction of The Shire. In Tolkein's narrative, the hobbits have to fight a battle, sacrificing some of their own in the process of securing a better future for their people. It was how things tended to be done in Middle Earth.

Switch to the UK in April 2019 and it's not swords and shields but locks, glue, dance and song. The extraordinary protests by the new group, Extinction Rebellion, have brought not only climate breakdown into the limelight, but also biodiversity-loss, pollution and the myth that you can have infinite growth on a finite planet. Over the same period, vast numbers of schoolchildren have undertaken strikes and organised their own demonstrations. Swedish student Greta Thunberg has admonished administration after administration on her tour of European capital cities. Bank of England Governor, Mark Carney, starkly warned companies that if they don’t adjust to the reality of global warming, they will simply cease to exist. To top all of that off, David Attenborough delivered his bluntest warnings to date in a lengthy and compelling documentary - “Climate change: the facts”. In the light of all these developments, it almost feels as if I can put my feet up!

Of course, neither I nor we will put our feet up: if you don't hear from some Team-SkS members for a while, you can guarantee they are still busy on things climate-related, in various other ways. We know there will always be political opposition to climate science; the usual suspects will not stop peddling their contrarian talking-points and they will not go unopposed.

Misinformation-creep

In fact, a classic and well-documented example of misinformation-creep has happened in London, this past weekend. Marble Arch, one of the four key locations across London that has been occupied by Extinction Rebellion, is situated adjacent to Hyde Park. On April 20th, crowds gathered in Hyde Park to celebrate 4/20 Day, an annual occasion about which you can easily find out plenty, by looking it up using an internet search engine. A lot of litter resulted. This is not the first year in which 4/20 parties and litter have been mentioned together in the news. So what happened next? Can you guess?

Photos of the littered park were quickly circulated on social media, with captions like, “so this is what eco-warriors really think of the environment” and so on - see a typical screengrab from Facebook, below. Such things get circulated because too few people bother to fact-check. People don't fact-check either because they don't know how to, or because the story fits their narrative, an extremely narrow, evidence-free narrative in which climate protestors can only be equated with crusty hippies. Therefore there will be litter. And look! A photo of litter! QED!

aftermath of party in Hyde Park

Through such factors, things like this piece of fake-news can spread like wildfire. For example, on April 24th, the Facebook page of Wales Online had a story about an Extinction Rebellion protest in Cardiff. Within less than 24 hours, 159 comment-threads had been posted beneath the piece. On April 25th, I scrolled down through the first 100 original posts. Some 25% of them linked Extinction Rebellion with the litter in Hyde Park - although in fairness most such posts were debunked by others. But the whole business is a textbook example of how easily and rapidly a barefaced lie can spread around, in this Internet era.

The litter fake-narrative is, for once, straightforward to debunk. Furthermore,  Extinction Rebellion, who have been carefully recycling any rubbish, actually volunteered to help local council workers, sent to the park to tidy up the litter. But such silly attempts at smearing led to me asking a bigger question: what are the key objections to Extinction Rebellion and how do they rank, relative to one another? I thought this exercise would offer us a useful snapshot, since in some cases it may help to shape the way we talk to various people about climate change. Not in all cases, of course. Hence this recent tweet from George Monbiot:

If you are middle class, they call you a champagne socialist.
If you are working class, they say it's the politics of envy.
If you wear leather shoes, they call you a hypocrite.
If you don't, they call you a hippy.
Everyone, apparently, is disqualified from challenging the system.

Method

To take the pulse of anti-Extinction Rebellion sentiment, a five-page Daily Mail comments-thread was examined. The article above the line was by Dominic Lawson, it placed Extinction Rebellion in a negative light (what else would anybody expect from the Mail?) and it generated hundreds of comments. Original posts and immediate responses were scrolled through – these being assumed to be posted by those with an axe to grind, since they had taken the trouble to set out their thoughts. A total of 208 comments that demonstrably objected to Extinction Rebellion were copied and pasted into a text document. The comments were then numbered and ranked into ten categories using a spreadsheet and the rankings were then plotted into a pie-chart.

It should be noted, by the way, that many such comments received strong rebuttals from other readers, but what is not known is whether the latter were Daily Mail regulars.

Results

Here's the chart:

pie-chart: types of objection to Extinction Rebellion

Let's take a look at the categories of objection, in order of popularity.

Generic fury against the left: 21.63% of comments

The Daily Mail appeals to those who lean politically to the right, so it comes as no surprise to find a lot of comments either specifically berating the protestors as “leftists” or “lefties” or advocating the police use water-cannon, batons and various other forms of authoritarian physical control on them.

Despite the fact that the laws of physics are apolitical, communicating climate change to right-leaning people has long been one of the greatest challenges faced by the scientific community. One reason is that right-wingers tend to be instinctively opposed to big government, and issues like climate change appear to be so massive that, so the logic goes, only massive governmental controls can adequately deal with the problem. Yet Conservatism itself is deeply rooted in the preservation of things. It is conservative to want to see biodiversity preserved for future generations to enjoy.

To address this contradiction in terms, there is an important point that must be taken into account. There is a difference between old-fashioned Conservatism and the current rapacious system that is largely responsible for the crisis we find ourselves in – Neoliberalism.

Neoliberalism is an extremist form of modern capitalist philosophy in which things only have worth if profit can be extracted from them. That includes us, folks. Neoliberalism first took root in Western economies some forty years ago and, while it has made a small number of people very wealthy, it has also impoverished millions and brought about a rate of biodiversity-loss equivalent to the great mass-extinctions dotted though the fossil record.

Neoliberalism calls for deregulation like no other philosophy – indeed it loves the sort of deregulated free-for-all that brought about the great banking-crash of 2008. As such, it can be argued that Neoliberalism is not Conservative at all, but is instead a pestilence that has by stealth managed to parasitise modern politics. As such, it is not just a problem for the Conservatives, but for all of us.

China syndrome: 18.27% of comments

The second commonest objection to Extinction Rebellion, it goes something like this: “what is the point of doing anything, when countries like China are causing so much pollution?” A similar kind of argument cites over-population, making up nearly a third of comments within this category. This is defeatism at its worst – as a commentator pointed out at the Guardian, it is akin to saying, "that guy is crapping on the floor, so why should I use the toilet?" Another commentator at the Guardian, on overpopulation, made the very important point:

“Population, as others have pointed out, is solving itself. The problem is not the final billion before we stabilise. It's the three or four billion who each want five or ten times as much stuff.“

Consumerism and Neoliberalism, of course, go hand-in-hand: one could not exist without the other. Here's where we can make a huge difference, by simply consuming a lot less stuff. Although Western countries like the UK have offset a lot of their carbon footprint by outsourcing the manufacture of stuff to countries like China, that offset could be instead become an eradication. If people stop buying the stuff in the first place, less of it will be made, equating to less emissions and less pollution. In any case, the Chinese are making considerable progress of their own, as reported in March in the Guardian.

Climate change denial 13.94% of comments

For a sample of 200+ comments in a newspaper that has constantly pushed climate change denial over several decades, such a percentage is at least encouraging. Outright denial of climate science is something that is perceivably on the wane here in the UK, although it has not by any means gone away. As events unfold, denial becomes an increasingly outlandish stance to take, in the face of so much accumulating hard evidence. This is, of course, no reason for complacency on our part.

Accusations of techno-hypocrisy: 13.46% of comments

This objection asserts that, since the protestors used powered travel to get to London and they have things like mobile phones, they are therefore hypocrites. Given that proposed solutions to climate breakdown tend to advocate vastly expanded availability and use of public transport, which is the best means by far of getting to London, the accusation itself has a ring of hypocrisy to it. Also, people need to remember that, while the protestors are advocating systemic change to avoid a nightmare scenario, they are compelled to do so within the system as it currently stands.

Inverse snobbery: 11.54% of comments

Banging away on their stereotypewriters, a substantial number of commentators stated that only middle-class people can afford the luxury of being able to protest. Looking back through the history of protest, it is clear that people of all backgrounds and classes have taken part – I think of the Jarrow Marchers of the 1930s, CND, anti-apartheid and many other examples. In the case of Extinction Rebellion, it is true that it arose through an academic background in 2018, but that does not mean that the movement is elitist: it regards itself as a broad church, open to all who share the same concerns – concerns which are not the sole domain of any one demographic in society.

But things get somewhat cloudier when you look at what some of the anti-Extinction Rebellion cheerleaders are actually saying. Witness this exchange between Tory MP David Davies and radio-journalist Shelagh Fogarty, on LBC. The MP told Fogarty that the protesters were "only able to take days off work because...we have the ability to pay people benefits because we have a capitalist system".

Fogarty replied: "You're making an assumption about people being on benefits are you?" Davies: "I am making an assumption about them yes, but I think it's probably a fair assumption...I'm not saying they're all on benefits but I'll bet you most of them aren't doing a normal 9 to 5 day's work." The MP continued: "Hundreds of thousands of ordinary people's lives are being disrupted, quite unfairly, by a smallest minority of arrogant, middle-class protesters."

Some of what Davies said falls into the next category. But it reminds one of the contradictory accusation sometimes levelled at immigrant people, who, “come over here and take our jobs and benefits” – both at the same time! Talking of benefits, Davies shows how out of touch with reality he is. A week's unemployment allowance, in the UK as things currently stand, would not even buy you a return train-ticket from Leeds to London. And in any case, if Davies really wants to learn what major disruption looks like, he should read up on the science (many days worth on here alone, David), and understand what the planet has in store for us, if we carry on like this for much longer. He certainly needs to look this stuff up, given another comment he made during the same exchange, revealing his somewhat limited grasp of the subject:

A rise of less than one degree, partly due to the end of the little ice age, doesn’t mean we should ban cars, flying & everything else which makes 21st century so great to live in.

Job/benefit envy: 8.17% of comments

“Some of us have to work”, is always going to crop up in such discussions. The concept, bereft of a shred of evidence, is that the protestors are all workless dole-scroungers. Classifying them so allows them to be “othered” - i.e. they do not belong to our tribe - and as such are fair game for other forms of attack. That many Extinction Rebellion protestors are professionals – academics, doctors, lawyers and so on – using their annual leave in order to attend, kind of collides head-on with this particular objection.

Another important point here is that the sort of “business as usual” alluded to, by David Davies above, is exactly the problem. “Normal” is the cause of the biodiversity crisis – the never-ending cycle of travel-work-consume-as-much-as-you-can, repeated day in, day out, by countless millions of people. Or, as put by McEver Dugan and Evan Cholerton (Guardian, 24th April 2019):

Every day we go into work and spend our time and labour building a system that is burning us alive. The top polluters in the world are directly dependent on this effort.

This cycle may well be, “all we know”, but it is most certainly not, “all that is possible”.

Unclassifiable: 7.21% of comments

These are objections that were posted devoid of context, for example a comment that just says, “idiots”. To which, the obvious question is, “why?”.

The Great Unwashed: 3.85% of comments

This category could probably be lumped together with “generic fury against the left”. It completely ignores the demographics of the protestors, opting instead for silly phrases like, “soap-dodgers” and so on. Again, the idea is to “other” the protestors, set them apart from the tribe, yet again it is not based on a shred of evidence.

Conspiracy theories: 1.44% of comments

Only a few of these, advancing ideas such as the protestors being secretly funded by shadowy billionaires or even that the protest is a “false flag” event. There have always been conspiracy theorists. It seems that, for some, reality is never interesting enough.

Publicity-aversion: 0.48% of comments

A minority of objections, too. The idea is that if you ignore these people, then they will go away. File under, “wishful thinking”.

Extinction Rebellion in London, Easter 2019

Above: Extinction Rebellion in London, Easter 2019. The pink boat, used as a focal point and stage, is named the 'Berta Caceres' after the prominent Honduran environmental activist, assassinated in 2016. Image: Fernando García Vicario, via Katy Fowler. A good selection of photographs from the Extinction Rebellion Easter protests can be viewed here.

Looking forward

So there you have it. There are clearly some people that one cannot reason with. But importantly, there are points arising from the results of this brief analysis that may be worthy of further consideration, when engaging with people about climate. The difference between traditional Conservatism and Neoliberalism is perhaps the most important example. Cutting down through the chilling Neoliberal psychology that underpins far too much policy-making today, into the underlying wish to preserve desirable things, like Nature, may help bring a further turn-around.

I'm not a member of Extinction Rebellion, since one can only spread butter so thinly and writing for Skeptical Science and, in more recent years, for some other projects, has been my thing. But I support their aims. So I thought I'd ask a local friend and Extinction Rebellion stalwart, Katy Fowler, to offer her thoughts on some of the objections raised by the opposition. Katy spent several days down in London, so if anybody understands the demographics of the group, she does:

"I spent three amazing days at Oxford Circus, stewarding at the welcome desk. During that time I spoke to hundreds of people, from all walks of life. About half were People of Colour and about a quarter were tourists or visitors. All bar five were curious, positive or downright enthusiastic and delighted. Most had never heard of Extinction Rebellion before.

The five that were less supportive included: one who believed in climate change but didn't think we could make a difference; one young lad who couldn't understand why there was a carnival atmosphere, one (drunk) man who came to shout at us about China and didn't want to listen to our responses (in the end the police stepped in and he ranted at them for five minutes and left); and two separate passers-by who said things along the lines of, "you only want to cause chaos" (a line from an editorial in the Evening Standard that day) and that we were useless hypocrites.
When our food tent was taken down and moved to Marble Arch on Wednesday morning, people were coming up to the desk regularly, asking if they could buy food to donate. Our free food table was constantly full. We also had so many requests if we were taking donations that we put a pot out and received hundreds of pounds. One older Asian gentleman gave us a £50 note!
People were often very emphatic in their gratitude that something big was finally happening. We trained hundreds of people in Non Violent Direct Action. Took hundreds of sign up sheets. Transformed a polluted shrine to consumerism into a people-friendly festival of life, hope and peaceful rebellion."

Extinction Rebellion have made three key demands, The first was for the government to tell the truth by declaring a climate and ecological emergency and working with other institutions to communicate the urgency for change. The second was to halt biodiversity loss and reduce greenhouse gas emissions to net zero by 2025: a very ambitious time-scale maybe, but the need for change is nevertheless urgent. Thirdly, that the government must create and be led by the decisions of a Citizens’ Assembly on climate and ecological justice. As someone with a long involvement in the climate debate, I would also have a fourth demand: tell them how the Goddam Planet works.

By this, I mean that if, “how the planet works”, had been a compulsory part of our National Curriculum, and its predecessors, in schools from the 1950s onwards, there would have been no need for Extinction Rebellion. The planet is our only home, but outside of the Earth Science community, detailed knowledge of the development of life on Earth and what sustains it – and what has come close to wiping it out, is not commonplace. It's as if Planet Earth has been an irrelevance for all these years. Yet the basic principles could easily be taught at a secondary school level, alongside the more traditional physics, chemistry and biology. It would mean far more people would be better-equipped to help maintain a living planet: what's not to like about that?



from Skeptical Science http://bit.ly/2L9IQRg