Are December’s solstice and January’s perihelion related?

Earth and sun via ISS Expedition 13/ NASA.

Earth came closest to the sun on January 3, 2019 5:20 UTC (12:20 a.m. EST; translate UTC to your time). This event is called Earth’s perihelion. Meanwhile, the December solstice took place on December 21, 2018. At perihelion in January, Earth swings to within about 91 million miles (147 million km) of the sun. That’s in contrast to six months from now, when we’ll be about 94 million miles (152 million km) from the sun. At the December solstice, Earth’s Southern Hemisphere is tilted most toward the sun; it’s the height of summer in that hemisphere. Are the December solstice and January perihelion related? No. It’s just a coincidence that they come so close together.

The date of Earth’s perihelion drifts as the centuries pass. These two astronomical events are separated by about two weeks for us. But they were closer a few centuries ago – and in fact happened at the same time in 1246 AD.

As the centuries continue to pass, these events will drift even farther apart. On the average, one revolution of the Earth relative to perihelion is about 25 minutes longer than one revolution relative to the December solstice. Perihelion advances one full calendar date every 60 or so years.

Earth’s perihelion – or closest point to the sun – will happen at the same time as the March equinox in about 6430 AD.

Bottom line: Earth’s December solstice and January perihelion are not related.

Earth closest to the sun on January 2-3, 2019

Everything you need to know: December solstice

Why does the New Year begin on January 1?



from EarthSky http://bit.ly/2F74a5l

Earth and sun via ISS Expedition 13/ NASA.

Earth came closest to the sun on January 3, 2019 5:20 UTC (12:20 a.m. EST; translate UTC to your time). This event is called Earth’s perihelion. Meanwhile, the December solstice took place on December 21, 2018. At perihelion in January, Earth swings to within about 91 million miles (147 million km) of the sun. That’s in contrast to six months from now, when we’ll be about 94 million miles (152 million km) from the sun. At the December solstice, Earth’s Southern Hemisphere is tilted most toward the sun; it’s the height of summer in that hemisphere. Are the December solstice and January perihelion related? No. It’s just a coincidence that they come so close together.

The date of Earth’s perihelion drifts as the centuries pass. These two astronomical events are separated by about two weeks for us. But they were closer a few centuries ago – and in fact happened at the same time in 1246 AD.

As the centuries continue to pass, these events will drift even farther apart. On the average, one revolution of the Earth relative to perihelion is about 25 minutes longer than one revolution relative to the December solstice. Perihelion advances one full calendar date every 60 or so years.

Earth’s perihelion – or closest point to the sun – will happen at the same time as the March equinox in about 6430 AD.

Bottom line: Earth’s December solstice and January perihelion are not related.

Earth closest to the sun on January 2-3, 2019

Everything you need to know: December solstice

Why does the New Year begin on January 1?



from EarthSky http://bit.ly/2F74a5l

See it! Moon and Venus at sunrise

Best New Year’s gift ever! EarthSky moon calendar for 2019

The moon Venus rising over Whitehaven NW England on January 2, 2019. Photo by Adrian Strand.

The moon Venus rising over Whitehaven NW England on January 2, 2019. Photo by Adrian Strand.

Photo of Venus and the moon with bare trees silhouette above Anchorage, Alaska on January 1, 2019 by Doug Short.

Doug Short captured Venus and the moon above Anchorage, Alaska on the morning of January 1, 2019.

Photo of the crescent moon and planet Venus in the dark sky before sunrise on January 2, 2019 over Singapore.

Kannan a wrote, “The waning crescent moon and the planet Venus conjunction this morning (January 2) here in Singapore before sunrise was a most breathtaking moment for the start of the first working day of 2019.”

Photo of the moon and Venus rising in the east

The moon and Venus rising in the east. January 2, 2019. Photo by Dennis Chabot.

2 images of Venus at the moon from North Borneo, one taken at 3:15 a.am. and the other 2 hours later.

Photo by Jenney Disimon. She wrote, “Moon and Venus pairing, Sabah, North Borneo. 2nd Jan 2019.”

Photo by Vermont Coronel of the moon and a cool-hued Venus, an hour in a dark sky before sunrise in Manila.

Vermont Coronel Jr. wrote, “Moon and a cool-hued Venus, an hour before sunrise in Manila.”

Duncan Tolmie captured the moon and Venus at 3:30 a.m. on January 2, 2019 in Warwick, Queensland, Australia.

Duncan Tolmie captured the moon and Venus at 3:30 a.m. on January 2, 2019 in Warwick, Queensland, Australia.

Bottom line: Photos of the moon and Venus before sunrise in early January 2019.



from EarthSky http://bit.ly/2SEdh1y

Best New Year’s gift ever! EarthSky moon calendar for 2019

The moon Venus rising over Whitehaven NW England on January 2, 2019. Photo by Adrian Strand.

The moon Venus rising over Whitehaven NW England on January 2, 2019. Photo by Adrian Strand.

Photo of Venus and the moon with bare trees silhouette above Anchorage, Alaska on January 1, 2019 by Doug Short.

Doug Short captured Venus and the moon above Anchorage, Alaska on the morning of January 1, 2019.

Photo of the crescent moon and planet Venus in the dark sky before sunrise on January 2, 2019 over Singapore.

Kannan a wrote, “The waning crescent moon and the planet Venus conjunction this morning (January 2) here in Singapore before sunrise was a most breathtaking moment for the start of the first working day of 2019.”

Photo of the moon and Venus rising in the east

The moon and Venus rising in the east. January 2, 2019. Photo by Dennis Chabot.

2 images of Venus at the moon from North Borneo, one taken at 3:15 a.am. and the other 2 hours later.

Photo by Jenney Disimon. She wrote, “Moon and Venus pairing, Sabah, North Borneo. 2nd Jan 2019.”

Photo by Vermont Coronel of the moon and a cool-hued Venus, an hour in a dark sky before sunrise in Manila.

Vermont Coronel Jr. wrote, “Moon and a cool-hued Venus, an hour before sunrise in Manila.”

Duncan Tolmie captured the moon and Venus at 3:30 a.m. on January 2, 2019 in Warwick, Queensland, Australia.

Duncan Tolmie captured the moon and Venus at 3:30 a.m. on January 2, 2019 in Warwick, Queensland, Australia.

Bottom line: Photos of the moon and Venus before sunrise in early January 2019.



from EarthSky http://bit.ly/2SEdh1y

Latest sunrises (north) and sunsets (south) in early January

Photo at top: Peter Bowers

So you like to sleep late, but don’t want to miss the sunrise? If you’re in the Northern Hemisphere, this time of year is for you. Sleep on! The latest sunrises of 2019 are happening around now for mid-latitudes in the Northern Hemisphere. For example, sunrise time in the central U.S. – say, around Wichita, Kansas – for the next several days will be around 7:45 a.m.

Meanwhile, if you live in the Southern Hemisphere, your latest sunsets are happening around now, assuming you’re at mid-southern latitudes.

Many sky watchers notice this phenomenon, which is part of an unvarying sequence each year. For us at mid-northern latitudes in the Northern Hemisphere, the sequence is: earliest sunset in early December, shortest day at the solstice around December 21, latest sunrise in early January.

At middle latitudes in the Southern Hemisphere, the sequence is: earliest sunrise in early December, longest day at the December solstice, latest sunset in early January.

This natural order is part of what we can expect, every year, on our tilted Earth, pursuing our elliptical orbit around the sun.

The discrepancy between the clock and sun gives us the latest sunrises after the winter solstice for mid-latitudes in the Northern Hemisphere. Photo of the Larkin sundial via Anika Malone

The December solstice always brings the shortest day to the Northern Hemisphere and the longest day to the Southern Hemisphere. But, clearly, the latest sunrise doesn’t coincide with the day of least daylight, and the latest sunset doesn’t happen on the day of greatest daylight. Why not?

The main reason is that the Earth’s rotational axis is tilted 23.5o out of vertical to the plane of our orbit around the sun. A secondary reason is that the Earth’s orbit isn’t a perfect circle. Due to our eccentric orbit (that’s an orbit shaped like a squashed circle, with the sun slightly off center), Earth travels fastest in January and slowest in July.

Clock time gets a bit out of sync with sun time – by about the tune of 1/2 minute per day for several weeks around the December solstice.

Because solar noon (midday) comes later by the clock today than on the solstice, so do the times of sunrise and sunset. The table below helps to explain:

For Philadelphia, Pennsylvania

Date Sunrise Solar Noon (Midday) Sunset Daylight Hours
December 7 7:09 a.m. 11:52 a.m. 4:35 p.m. 9 hours 26 minutes
December 21 7:19 a.m. 11:59 a.m. 4:39 p.m. 9 hours 20 minutes
January 3 7:23 a.m. 12:05 p.m. 4:48 p.m. 9 hours 25 minutes

The exact date for the latest sunrise or latest sunset varies by latitude. At present, mid-temperate latitudes in the Northern Hemisphere are waking up to their latest sunrises, while the Southern Hemisphere’s mid-temperate latitudes are watching their latest sunsets. At latitudes closer to the equator, the latest sunrise or latest sunset has yet to come. Closer to the Arctic and Antarctic Circles, the latest sunrise and latest sunset have already come and gone.

But in either the Northern or Southern Hemisphere, the sequence is always the same:

1) earliest sunset, winter solstice, latest sunrise
2) earliest sunrise, summer solstice, latest sunset

Sunrise on a cloudy day at Grant Park Beach in South Milwaukee, Wisconsin. Photo by Heather Kamine.

Bottom line: Notice the time of sunrise and sunset at this time of year. If you’re in the Northern Hemisphere, your latest sunrises are happening around now at mid-northern latitudes. If you’re in the Southern Hemisphere, mid-latitudes are watching the year’s latest sunsets. Enjoy them!

A planisphere is virtually indispensable for beginning stargazers. Order your EarthSky Planisphere today!

Earth comes closest to the sun in early January



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

Photo at top: Peter Bowers

So you like to sleep late, but don’t want to miss the sunrise? If you’re in the Northern Hemisphere, this time of year is for you. Sleep on! The latest sunrises of 2019 are happening around now for mid-latitudes in the Northern Hemisphere. For example, sunrise time in the central U.S. – say, around Wichita, Kansas – for the next several days will be around 7:45 a.m.

Meanwhile, if you live in the Southern Hemisphere, your latest sunsets are happening around now, assuming you’re at mid-southern latitudes.

Many sky watchers notice this phenomenon, which is part of an unvarying sequence each year. For us at mid-northern latitudes in the Northern Hemisphere, the sequence is: earliest sunset in early December, shortest day at the solstice around December 21, latest sunrise in early January.

At middle latitudes in the Southern Hemisphere, the sequence is: earliest sunrise in early December, longest day at the December solstice, latest sunset in early January.

This natural order is part of what we can expect, every year, on our tilted Earth, pursuing our elliptical orbit around the sun.

The discrepancy between the clock and sun gives us the latest sunrises after the winter solstice for mid-latitudes in the Northern Hemisphere. Photo of the Larkin sundial via Anika Malone

The December solstice always brings the shortest day to the Northern Hemisphere and the longest day to the Southern Hemisphere. But, clearly, the latest sunrise doesn’t coincide with the day of least daylight, and the latest sunset doesn’t happen on the day of greatest daylight. Why not?

The main reason is that the Earth’s rotational axis is tilted 23.5o out of vertical to the plane of our orbit around the sun. A secondary reason is that the Earth’s orbit isn’t a perfect circle. Due to our eccentric orbit (that’s an orbit shaped like a squashed circle, with the sun slightly off center), Earth travels fastest in January and slowest in July.

Clock time gets a bit out of sync with sun time – by about the tune of 1/2 minute per day for several weeks around the December solstice.

Because solar noon (midday) comes later by the clock today than on the solstice, so do the times of sunrise and sunset. The table below helps to explain:

For Philadelphia, Pennsylvania

Date Sunrise Solar Noon (Midday) Sunset Daylight Hours
December 7 7:09 a.m. 11:52 a.m. 4:35 p.m. 9 hours 26 minutes
December 21 7:19 a.m. 11:59 a.m. 4:39 p.m. 9 hours 20 minutes
January 3 7:23 a.m. 12:05 p.m. 4:48 p.m. 9 hours 25 minutes

The exact date for the latest sunrise or latest sunset varies by latitude. At present, mid-temperate latitudes in the Northern Hemisphere are waking up to their latest sunrises, while the Southern Hemisphere’s mid-temperate latitudes are watching their latest sunsets. At latitudes closer to the equator, the latest sunrise or latest sunset has yet to come. Closer to the Arctic and Antarctic Circles, the latest sunrise and latest sunset have already come and gone.

But in either the Northern or Southern Hemisphere, the sequence is always the same:

1) earliest sunset, winter solstice, latest sunrise
2) earliest sunrise, summer solstice, latest sunset

Sunrise on a cloudy day at Grant Park Beach in South Milwaukee, Wisconsin. Photo by Heather Kamine.

Bottom line: Notice the time of sunrise and sunset at this time of year. If you’re in the Northern Hemisphere, your latest sunrises are happening around now at mid-northern latitudes. If you’re in the Southern Hemisphere, mid-latitudes are watching the year’s latest sunsets. Enjoy them!

A planisphere is virtually indispensable for beginning stargazers. Order your EarthSky Planisphere today!

Earth comes closest to the sun in early January



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

A breath test with the goal of detecting multiple cancers is ready to start trials

The warning signs for cancer can be vague. When people go to their GP with symptoms like heartburn or indigestion, it’s hard to say during their first appointment if cancer is to blame or if, most often, it’s something far less serious.

At the moment, being offered a simple test that points either way, or flags those who need to go to a specialist for further tests, isn’t possible across a wide range of cancers.

But Professor Rebecca Fitzgerald, a Cancer Research UK-funded scientist from the MRC Cancer Unit at the University of Cambridge, is leading a trial that’s looking to bring a potential cancer test like this closer to the clinic. And all that’s needed is a person’s breath.

“The PAN trial is seeing if you can use a breath test device that detects volatile molecules from the breath to identify patients that might have an early cancer that they don’t know about,” says Fitzgerald.

Testing a range of cancers

The trial, running in collaboration with Owlstone Medical at Addenbrooke’s Hospital in Cambridge, will test the company’s Breath Biopsy® technology that picks up distinctive molecules released by cells as they make and process energy (metabolism).

And it’s the first trial to look at whether this technology can pick up a range of cancers.

This is a pilot study, so first we’re looking at a range of cancers to see if we get a signal and compare the signal to healthy individuals.

Professor Rebecca Fitzgerald, trial lead

“Intuitively, lung cancer seems the most obvious cancer to be detected in the breath,” says Fitzgerald, adding that lung cancer breath studies using the Owlstone tech are already ongoing.

“But because of the way metabolites are recycled in the body, many other volatile molecules from other areas of the body end up in the breath too.”

By 2021, Fitzgerald and the team at Owlstone aim to have collected and analysed the breath of 1,500 people. They want to find patterns, or ‘signatures’, in the breath molecules from people who are either healthy or who have suspected oesophageal, stomach, prostate, kidney, bladder, liver or pancreatic cancer.

“This is a pilot study, so first we’re looking at a range of cancers to see if we get a signal and compare the signal to healthy individuals,” says Fitzgerald.

If the sophisticated tech can tell apart cancer signatures and healthy ones, the team will next see if there are differences between cancer types, or if there’s just one ‘cancer signature’.

A real-life scenario

Fitzgerald says the most important thing about this trial is the design.

“We’re not just doing this retrospectively with people with advanced cancer,” she says. Instead, the trial will recruit people who have gone to their doctor because they have potential symptoms of cancer, or because they have a condition that puts them at a higher risk of developing the disease.

To give us a better idea if this tech would be useful in GP surgeries, people’s breath signatures need to be recorded no matter what their diagnosis ends up being.

Take kidney (renal) cancer as an example. “We need to compare patients who have suspected renal cancer who might have blood in their urine, but it actually turns out to be nothing, with those who are showing the same symptom but have cancer,” says Fitzgerald.

Who’s taking part?

People at higher risk of certain cancers could be the first to benefit from this type of test. Barrett’s oesophagus is a condition that can sometimes develop into oesophageal cancer, with between 1 and 5 people in every 100 with Barrett’s going on to develop the disease.

Rebecca has had Barrett’s oesophagus for over 20 years.

Rebecca, aged 54, has had the condition for over 20 years and needs careful monitoring. She has an endoscopy every 2 years to keep an eye on things.

“I’m used to endoscopies by now, you just have to get on with them. But they can be painful and invasive, so when I have one I choose to be sedated.”

Rebecca says it’s unpleasant seeing the “fairly large” tube go down her throat. “The procedure means a whole day out and it takes quite a while to recover afterwards.”

Endoscopies also leave her very sore because tissue samples are taken from her oesophagus so they can be tested in the lab for cancer cells.

Rebecca says she’d certainly like to see less invasive tests that could be used to detect cancer. That’s why she agreed to be one of the first people to take part in the PAN trial.

“Something like a breath test sounds so much better than what I have to have, so I was very happy to do the trial. After the breath test I felt fine, it was a very easy and there was no discomfort.”

“The more these conditions can be researched, and kinder detection tests developed, the better,” she adds.

Future screening tool

Depending on how these early trials go, the breath test could reach further than keeping an eye on those with a raised risk of cancer. This technology has the potential to be used on the wider population as a screening tool to find early cancers in people without symptoms of cancer.

“We need to make it as easy as possible for the individual to have a breath test,” she says. “Ideally the device would be in the GP setting.”

But before the Breath Biopsy® can reach GP surgeries, several large studies would need to confirm any benefits outweigh any risks.

“Eventually, I imagine it used as a screening tool where you test well people, or a triage test that can sit in the surgery to help GPs know who to refer.”

What’s next?

The future of Owlstone’s breath test depends on what the data from this first trial shows. By the time each sample has been analysed they hope to have a fixed breath signature for cancer, or better, multiple signatures that single out different cancer types.

The biggest challenge the researchers face is getting enough patients across the variety of cancers they want to investigate. But Fitzgerald and the team are confident that the simple, non-invasive nature of the test should hopefully mean it gets some interest.

“All we need from our participants is around 10 minutes of breath. I have no doubt that if the individuals come forward, then we’ll have enough data to make the necessary conclusions that, if promising, can bring a cancer breath test one step closer to patients and their doctors.”

Gabi



from Cancer Research UK – Science blog http://bit.ly/2QlDNuu

The warning signs for cancer can be vague. When people go to their GP with symptoms like heartburn or indigestion, it’s hard to say during their first appointment if cancer is to blame or if, most often, it’s something far less serious.

At the moment, being offered a simple test that points either way, or flags those who need to go to a specialist for further tests, isn’t possible across a wide range of cancers.

But Professor Rebecca Fitzgerald, a Cancer Research UK-funded scientist from the MRC Cancer Unit at the University of Cambridge, is leading a trial that’s looking to bring a potential cancer test like this closer to the clinic. And all that’s needed is a person’s breath.

“The PAN trial is seeing if you can use a breath test device that detects volatile molecules from the breath to identify patients that might have an early cancer that they don’t know about,” says Fitzgerald.

Testing a range of cancers

The trial, running in collaboration with Owlstone Medical at Addenbrooke’s Hospital in Cambridge, will test the company’s Breath Biopsy® technology that picks up distinctive molecules released by cells as they make and process energy (metabolism).

And it’s the first trial to look at whether this technology can pick up a range of cancers.

This is a pilot study, so first we’re looking at a range of cancers to see if we get a signal and compare the signal to healthy individuals.

Professor Rebecca Fitzgerald, trial lead

“Intuitively, lung cancer seems the most obvious cancer to be detected in the breath,” says Fitzgerald, adding that lung cancer breath studies using the Owlstone tech are already ongoing.

“But because of the way metabolites are recycled in the body, many other volatile molecules from other areas of the body end up in the breath too.”

By 2021, Fitzgerald and the team at Owlstone aim to have collected and analysed the breath of 1,500 people. They want to find patterns, or ‘signatures’, in the breath molecules from people who are either healthy or who have suspected oesophageal, stomach, prostate, kidney, bladder, liver or pancreatic cancer.

“This is a pilot study, so first we’re looking at a range of cancers to see if we get a signal and compare the signal to healthy individuals,” says Fitzgerald.

If the sophisticated tech can tell apart cancer signatures and healthy ones, the team will next see if there are differences between cancer types, or if there’s just one ‘cancer signature’.

A real-life scenario

Fitzgerald says the most important thing about this trial is the design.

“We’re not just doing this retrospectively with people with advanced cancer,” she says. Instead, the trial will recruit people who have gone to their doctor because they have potential symptoms of cancer, or because they have a condition that puts them at a higher risk of developing the disease.

To give us a better idea if this tech would be useful in GP surgeries, people’s breath signatures need to be recorded no matter what their diagnosis ends up being.

Take kidney (renal) cancer as an example. “We need to compare patients who have suspected renal cancer who might have blood in their urine, but it actually turns out to be nothing, with those who are showing the same symptom but have cancer,” says Fitzgerald.

Who’s taking part?

People at higher risk of certain cancers could be the first to benefit from this type of test. Barrett’s oesophagus is a condition that can sometimes develop into oesophageal cancer, with between 1 and 5 people in every 100 with Barrett’s going on to develop the disease.

Rebecca has had Barrett’s oesophagus for over 20 years.

Rebecca, aged 54, has had the condition for over 20 years and needs careful monitoring. She has an endoscopy every 2 years to keep an eye on things.

“I’m used to endoscopies by now, you just have to get on with them. But they can be painful and invasive, so when I have one I choose to be sedated.”

Rebecca says it’s unpleasant seeing the “fairly large” tube go down her throat. “The procedure means a whole day out and it takes quite a while to recover afterwards.”

Endoscopies also leave her very sore because tissue samples are taken from her oesophagus so they can be tested in the lab for cancer cells.

Rebecca says she’d certainly like to see less invasive tests that could be used to detect cancer. That’s why she agreed to be one of the first people to take part in the PAN trial.

“Something like a breath test sounds so much better than what I have to have, so I was very happy to do the trial. After the breath test I felt fine, it was a very easy and there was no discomfort.”

“The more these conditions can be researched, and kinder detection tests developed, the better,” she adds.

Future screening tool

Depending on how these early trials go, the breath test could reach further than keeping an eye on those with a raised risk of cancer. This technology has the potential to be used on the wider population as a screening tool to find early cancers in people without symptoms of cancer.

“We need to make it as easy as possible for the individual to have a breath test,” she says. “Ideally the device would be in the GP setting.”

But before the Breath Biopsy® can reach GP surgeries, several large studies would need to confirm any benefits outweigh any risks.

“Eventually, I imagine it used as a screening tool where you test well people, or a triage test that can sit in the surgery to help GPs know who to refer.”

What’s next?

The future of Owlstone’s breath test depends on what the data from this first trial shows. By the time each sample has been analysed they hope to have a fixed breath signature for cancer, or better, multiple signatures that single out different cancer types.

The biggest challenge the researchers face is getting enough patients across the variety of cancers they want to investigate. But Fitzgerald and the team are confident that the simple, non-invasive nature of the test should hopefully mean it gets some interest.

“All we need from our participants is around 10 minutes of breath. I have no doubt that if the individuals come forward, then we’ll have enough data to make the necessary conclusions that, if promising, can bring a cancer breath test one step closer to patients and their doctors.”

Gabi



from Cancer Research UK – Science blog http://bit.ly/2QlDNuu

EarthSky’s 2019 meteor shower guide

What are the odds?! This amazing image is from Emma Zulaiha Zulkifli in Sabah, on the island of Borneo in Malaysia. She caught a bright meteor streaking right in front of the bright planet Venus on December 15, 2018. She wrote: “Yes, the meteor actually did streak in front of Venus! Only a bit of tweaking on contrast and noise reduction done in Photoshop CC2018.” Fuji X-A1, 18-55mm f2.8 with Tripod, Exif : iso2000, 30″, f2.8. Way to go, Emma!

January 4, 2019 Quadrantids

April 23, 2019 Lyrids

May 5, 2019 Eta Aquariids

Late July, 2019 Delta Aquariids

August 12, 2019 Perseids

October 9, 2019 Draconids

October 21, 2019 Orionids

November 5-6, 2018 South Taurids

November 12-13, 2019 North Taurids

November 18, 2019 Leonids

December 13-14, 2018 Geminids

December 22, 2018 Ursids

A word about moonlight

Most important: a dark sky

Know your dates and times

Where to go to watch a meteor shower

What to bring with you

Are the predictions reliable?

Remember …

Quadrantid radiant composite via Scott MacNeill of Frosty Drew Observatory in Charleston, Rhode Island.

January 4, 2019, before dawn, the Quadrantids
Although the Quadrantids can produce over 100 meteors per hour, the sharp peak of this shower tends to last only a few hours, and doesn’t always come at an opportune time. This year, the the almost-new waning crescent moon will ensure dark skies for this year’s production. Even though moonlight isn’t a factor this year, you still have to be in the right spot on Earth to view this meteor shower in all its splendor. The radiant point is in the part of the sky that used to be considered the constellation Quadrans Muralis the Mural Quadrant. You’ll find this radiant near the famous Big Dipper asterism (chart here), in the north-northeastern sky after midnight and highest up before dawn. Because the radiant is fairly far to the north on the sky’s dome, meteor numbers will be greater at northerly latitudes in the Northern Hemisphere. In 2019, watch in the wee hours – after midnight and before dawn – on January 4. Fortunately, the absence of moonlight provides a big plus for watching this year’s Quadrantid meteor shower.

Everything you need to know: Quadrantid meteor shower

Lyrid meteor on April 21, 2014. Simon Waldram in Fuerteventura, in the Canary Islands, discovered this one as he finished batch editing 320 photos to make a startrail image. Thanks, Simon!

Lyrid meteor in 2014 by Simon Waldram in Fuerteventura in the Canary Islands. He discovered it as he finished batch editing 320 photos to make a startrail image.

April 23, 2019, before dawn, the Lyrids
The Lyrid meteor shower – April’s shooting stars – lasts from about April 16 to 25. About 10 to 15 meteors per hour can be expected around the shower’s peak on a dark, moonless night. Unfortunately, in 2019, the almost-full waning gibbous moon will pretty much wash out this year’s Lyrid meteor shower. The Lyrids are known for uncommon surges that can sometimes bring the rate up to 100 per hour. Those rare outbursts are not easy to predict, but they’re one of the reasons the tantalizing Lyrids are worth checking out. The radiant for this shower is near the bright star Vega in the constellation Lyra (chart here), which rises in the northeast at about 10 p.m. on April evenings. In 2019, we expect the peak viewing hours to take place in the dark hours before dawn April 23, but under the light of a bright waning gibbous moon.

Everything you need to know: Lyrid meteor shower

Long meteor caught during the peak of last week's Eta Aquarid meteor shower, May 6, 2016. Photo by Darla Young.

Long meteor caught during the peak of the May 2016 Eta Aquariid meteor shower, by Darla Young.

May 5, 2019, before dawn, the Eta Aquariids
This meteor shower has a relatively broad maximum – meaning you can watch it the day before and after the predicted peak morning of May 5. This shower favors the Southern Hemisphere, and is often the Southern Hemisphere’s best meteor shower of the year. In 2019, the new moon on May 4 guarantees dark nights for this year’s Eta Aquariid shower. The radiant is near the star Eta in the constellation Aquarius the Water Bearer (click here for chart). The radiant comes over the eastern horizon at about 4 a.m. local time; that is the time at all locations across the globe. For that reason, the hour or two before dawn tends to offer the most Eta Aquariid meteors, no matter where you are on Earth. At northerly latitudes – like those in the northern U.S. and Canada, or northern Europe, for example – the meteor numbers are typically lower for this shower. In the southern half of the U.S., 10 to 20 meteors per hour might be visible in a dark sky. Farther south – for example, at latitudes in the Southern Hemisphere – the meteor numbers may increase dramatically, with perhaps two to three times more Eta Aquariid meteors streaking the southern skies (on a dark, moonless night). For the most part, the Eta Aquariids are a predawn shower. In 2019, the most meteors will probably rain down in the predawn sky on May 5 – in a dark sky unmarred by moonlight! The broad peak to this shower means that some meteors may fly for a few days before and after the predicted optimal date.

Everything you need to know: Eta Aquariid meteor shower

David S. Brown caught this meteor on July 30, 2014, in southwest Wyoming.

Delta Aquariid in 2014, from David S. Brown in southwest Wyoming.

Late July 2019, before dawn, the Delta Aquariids
Like the Eta Aquariids in May, the Delta Aquariid meteor shower in July favors the Southern Hemisphere and tropical latitudes in the Northern Hemisphere. But these meteors can be seen from around the world. This year, fortunately, the new moon on August 1 will provide dark skies, which is especially important, because these faint meteors display very few fireballs or persistent trains. The meteors appear to radiate from near the star Skat or Delta in the constellation Aquarius the Water Bearer. The maximum hourly rate can reach 15 to 20 meteors in a dark sky. The nominal peak is around July 27-30, but, unlike many meteor showers, the Delta Aquariids lack a very definite peak. Instead, these medium-speed meteors ramble along fairly steadily throughout late July and early August. An hour or two before dawn usually presents the most favorable view of the Delta Aquariids. At the shower’s peak in late July 2019, the rather faint Delta Aquariid meteors will not have to contend with moonlight, so this is indeed a favorable year for watching this shower.

Everything you need to know: Delta Aquariid shower

The 2017 Perseid meteor shower peaked in moonlight, but that didn’t stop Hrvoje Crnjak in Šibenik, Croatia, from catching this bright Perseid on the morning of August 12, 2017. Notice the variations in brightness and color throughout, and the little “pop” of brightness toward the bottom. A brightness “pop” like that comes from a clump of vaporizing debris. Thank you, Hrvoje!

Late evening to dawn on August 11, 12 and 13, 2019, the Perseids
The Perseid meteor shower is perhaps the most beloved meteor shower of the year for the Northern Hemisphere. It’s a rich meteor shower, and it’s steady. Best of all, the slender waxing crescent moon will set at early evening, providing deliciously dark skies for this year’s Perseid meteors. These swift and bright meteors radiate from a point in the constellation Perseus the Hero. As with all meteor shower radiant points, you don’t need to know Perseus to watch the shower; instead, the meteors appear in all parts of the sky. These meteors frequently leave persistent trains. Perseid meteors tend to strengthen in number as late night deepens into midnight, and typically produce the most meteors in the wee hours before dawn. In 2019, the peak night of this shower will be marred by the brilliant waxing gibbous moon, although the brighter Perseids will likely overcome the moonlit glare. Predicted peak in 2019: the night of August 12-13, but try the nights before and after, too, from late night until dawn.

All you need to Know: Perseid meteor shower

Draconids near Tucson, Arizona, in 2013, by our friend Sean Parker Photography.

Draconids near Tucson, Arizona, in 2013, by our friend Sean Parker Photography.

October 8 or 9, 2019, nightfall and evening, the Draconids
The radiant point for the Draconid meteor shower almost coincides with the head of the constellation Draco the Dragon in the northern sky. That’s why the Draconids are best viewed from the Northern Hemisphere. The Draconid shower is a real oddity, in that the radiant point stands highest in the sky as darkness falls. That means that, unlike many meteor showers, more Draconids are likely to fly in the evening hours than in the morning hours after midnight. This shower is usually a sleeper, producing only a handful of languid meteors per hour in most years. But watch out if the Dragon awakes! In rare instances, fiery Draco has been known to spew forth many hundreds of meteors in a single hour. In 2019, watch the Draconid meteors at nightfall and early evening on October 8. Try the nights of October 7 and 9, too. Unfortunately, the bright waxing gibbous moon is sure to intrude on this year’s production.

Spectacular Draconids in 2018?

Here is a beautiful aurora, with an Orionid meteor falling above it. Photo taken in 2013 by Tommy Eliassen Photography in Norway.

Orionid meteor with aurora in 2013, by Tommy Eliassen Photography in Norway.

October 22, 2019, before dawn, the Orionids
On a dark, moonless night, the Orionids exhibit a maximum of about 10 to 20 meteors per hour. Unfortunately, in 2019, the moon is just past last quarter and will somewhat obscure this year’s production. More meteors tend to fly after midnight, and the Orionids are typically at their best in the wee hours before dawn. These fast-moving meteors occasionally leave persistent trains. The Orionids sometimes produce bright fireballs, so watch for them to possibly overcome the moonlight. If you trace these meteors backward, they seem to come from the Club of the famous constellation Orion the Hunter. You might know Orion’s bright, ruddy star Betelgeuse. The radiant is north of Betelgeuse. The Orionids have a broad and irregular peak that isn’t easy to predict. This year, 2019, the moonlight will somewhat subdue this year’s Orionid meteor shower. Try in the wee hours before dawn on October 21 and 22, in the light of the waning moon.

Everything you need to know: Orionid meteor shower

View larger. | Jeff Dai in Tibet captured this Taurid fireball on November 10, 2015. He wrote:

In 2015, the Taurids put on a spectacular display of fireballs, which lasted many days. Photographer Jeff Dai captured this one over Yamdrok Lake in Tibet.

Late night November 5 until dawn November 6, 2019, the South Taurids
In 2019, the expected peak night of the South Taurid shower happens a few days after first quarter moon. But peak viewing is just after midnight, at which time the moon will have set or is close to setting. Click here to find out when the moon sets in your sky, remembering to check the moonrise and moonset box. The meteoroid streams that feed the South (and North) Taurids are very spread out and diffuse. The Taurids are extremely long-lasting (September 25 to November 25) but usually don’t offer more than about five meteors per hour. That is true even on the South Taurids’ peak night. The Taurids are, however, well known for having a high percentage of fireballs, or exceptionally bright meteors. Plus, the other Taurid shower – the North Taurids – adds a few more meteors to the mix during the South Taurids’ peak night. Peak viewing for a few hours, centered around 1 a.m. local time on November 5. But the South and North meteors continue to rain down throughout the following week, but with more interference from the waxing gibbous moon!

Late night November 12 until dawn November 13, 2019, the North Taurids
Like the South Taurids, the North Taurids meteor shower is long-lasting (October 12 – December 2) but modest, and the peak number is forecast at about five meteors per hour. Unfortunately, in 2019, the full moon will hamper the show, as it shines all night from dusk till dawn. The North and South Taurids combine to provide a nice sprinkling of meteors throughout October and November. Typically, you see the maximum numbers at around midnight, when Taurus the Bull is highest in the sky. Taurid meteors tend to be slow-moving, but sometimes very bright. In 2019, the predicted peak night is from late night November 12 till dawn November 19, but under the floodlight of the November 2019 full moon.

James Younger sent in this photos during the 2015 peak of the Leonid meteor shower. It's a meteor over the San Juan Islands in the Pacific Northwest, between the U.S. mainland and Vancouver Island, British Columbia. The San Juans are part of the U.S. state of Washington.

James Younger sent in this photo during the 2015 peak of the Leonid meteor shower. It’s a meteor over the San Juan Islands in the Pacific Northwest.

November 18, 2019, before dawn, the Leonids
In 2018, a bright waxing gibbous moon shines almost all night long on the peak night of the Leonid shower! However, the Leonids tend to produce the most meteors in the dark hour before dawn, at which time the moon will have set. (Click here to find out when the moon sets in your sky, remembering to check the moonrise and moonset box.) Radiating from the constellation Leo the Lion, the famous Leonid meteor shower has produced some of the greatest meteor storms in history – at least one in living memory, 1966 – with rates as high as thousands of meteors per minute during a span of 15 minutes on the morning of November 17, 1966. Indeed, on that beautiful night in 1966, the meteors did, briefly, fall like rain. Some who witnessed the 1966 Leonid meteor storm said they felt as if they needed to grip the ground, so strong was the impression of Earth plowing along through space, fording the meteoroid stream. The meteors, after all, were all streaming from a single point in the sky – the radiant point – in this case in the constellation Leo the Lion. Leonid meteor storms sometimes recur in cycles of 33 to 34 years, but the Leonids around the turn of the century – while wonderful for many observers – did not match the shower of 1966. And, in most years, the Lion whimpers rather than roars, producing a maximum of perhaps 10-15 meteors per hour on a dark night. Like many meteor showers, the Leonids ordinarily pick up steam after midnight and display the greatest meteor numbers just before dawn. In 2018, the Leonids are expected to fall most abundantly in the dark hour before dawn on November 17 or 18.

Everything you need to know: Leonid meteor shower

Cynthia Haithcock in Troy, North Carolina caught this Geminid on December 14. Looks like a bright one! She wrote:

Cynthia Haithcock in Troy, North Carolina, caught this Geminid in 2015. Looks like a bright one!

December 13-14, 2019, mid-evening until dawn, Geminids
Radiating from near the bright stars Castor and Pollux in the constellation Gemini the Twins, the Geminid meteor shower is one of the finest meteors showers visible in either the Northern or the Southern Hemisphere. In 2019, the just past full waning gibbous moon staying out for most of the night will bleach out the fainter Geminids. set before the peak viewing hours of the Geminid shower, from late evening until dawn. The meteors are plentiful, rivaling the August Perseids. They are often bold, white and bright. On a dark night, you can often catch 50 or more meteors per hour. The greatest number of meteors fall in the wee hours after midnight, centered around 2 a.m. local time (the time on your clock no matter where you are on Earth), when the radiant point is highest in the sky. In 2019, watch the usually reliable and prolific Geminid meteor shower from mid-evening December 13 until dawn December 14, though in moon-drenched skies.

Everything you need to know: Geminid meteor shower

December 22, 2019, before dawn, the Ursids
Die-hard meteor watchers in the Northern Hemisphere watch for Ursid meteors about a week after the Geminids. This low-key meteor shower is active each year from about December 17 to 26. The Ursids usually peak around the December solstice, perhaps offering 5 to 10 meteors per hour during the predawn hours in a dark sky. This year, in 2019, the waning crescent moon lighting up the morning hours will somewhat intrude on this year’s the Ursid shower.

Ursid shower peaks in moonlight

A word about moonlight. In 2019, moonlight poses no problem for the January Quadrantids and May Eta Aquariids. The moon won’t seriously interfere with the July Delta Aquariids, November South Taurids and December Usurids. Some moon-free time accompanies the August Perseids in the predawn sky. On the other hand, a nearly full moon obstructs the April Lyrids and November South Taurids. Our almanac page provides links for access to the moonrise and moonset times in your sky.

Most important: a dark sky. Here’s the first thing – the main thing – you need to know to become as proficient as the experts at watching meteors. That is, to watch meteors, you need a dark sky. It’s possible to catch a meteor or two or even more from the suburbs. But, to experience a true meteor shower – where you might see several meteors each minute – avoid city lights. EarthSky’s Stargazing page shows dark locations (zoom out for a worldwide view).

Know your dates and times. You also need to be looking on the right date, at the right time of night. Meteor showers occur over a range of dates, because they stem from Earth’s own movement through space. As we orbit the sun, we cross “meteor streams.” These streams of icy particles in space come from comets moving in orbit around the sun. Comets are fragile, icy bodies that litter their orbits with debris. When this cometary debris enters our atmosphere, it vaporizes due to friction with the air. If moonlight or city lights don’t obscure the view, we on Earth see the falling, vaporizing particles as meteors.

Where to go to watch a meteor shower. You can comfortably watch meteors from many places, assuming you have a dark sky: a rural back yard or deck, the hood of your car, the side of a road. State parks and national parks are good bets, but be sure they have a wide open viewing area, like a field; you don’t want to be stuck in the midst of a forest on meteor night. An EarthSky friend, veteran meteor-watcher and astrophotographer Sergio Garcia Rill, also offers this specific advice:

… you might want to give it a try but don’t know where to go. Well, in planning my night photoshoots I use a variety of apps and web pages to know how dark the sky is in a certain location, the weather forecast, and how the night sky will look. Here’s the link to Dark Sky Finder. It’s a website that shows the light pollution in and around cities in North America which has been fundamental for finding dark sites to set up shots. Dark Sky finder also has an app for iPhone and iPad which as of this writting is only 99 cents so you might want to look into that as well. For people not in North America, the Blue Marble Navigator might be able to help to see how bright are the lights near you.

The other tool I can suggest is the Clear Sky Chart. I’ve learned the hard way that, now matter how perfectly dark the sky is at your location, it won’t matter if there’s a layer of clouds between you and the stars. This page is a little hard to read, but it shows a time chart, with each column being an hour, and each row being one of the conditions like cloud coverage and darkness. Alternatively, you could try to see the regular weather forecast at the weather channel or your favorite weather app.

What to bring with you. You don’t need special equipment to watch a meteor shower. If you want to bring along equipment to make yourself more comfortable, consider a blanket or reclining lawn chair, a thermos with a hot drink, binoculars for gazing at the stars. Be sure to dress warmly enough, even in spring or summer, especially in the hours before dawn. Binoculars are fun to have. You won’t need them for watching the meteor shower, but, especially if you have a dark sky, you might not be able to resist pointing them at the starry sky.

Are the predictions reliable? Although astronomers have tried to publish exact predictions in recent years, meteor showers remain notoriously unpredictable. Your best bet is to go outside at the times we suggest, and plan to spend at least an hour, if not a whole night, reclining comfortably while looking up at the sky. Also remember that meteor showers typically don’t just happen on one night. They span a range of dates. So the morning before or after a shower’s peak might be good, too.

Remember … meteor showers are like fishing. You go, you enjoy nature … and sometimes you catch something.

Peak dates are derived from data published in the Observer’s Handbook by the Royal Astronomical Society of Canada and Guy Ottewell’s Astronomical Calendar.

This Geminid meteor is seen coming straight from its radiant point, which is near the two brightest stars in Gemini, Castor and Pollux. Photo taken on the night of December 12-13, 2012, by EarthSky Facebook friend Mike O’Neal in Oklahoma. He said the 2012 Geminid meteor shower was one of the best meteor shows he’s ever seen.

Bottom line: Look here for information about all the major meteor showers between now and the year’s end. There are some good ones!

EarthSky’s top 10 tips for meteor-watchers

Enjoy knowing where to look in the night sky? Please donate to help EarthSky keep going.



from EarthSky http://bit.ly/2F5gC6k

What are the odds?! This amazing image is from Emma Zulaiha Zulkifli in Sabah, on the island of Borneo in Malaysia. She caught a bright meteor streaking right in front of the bright planet Venus on December 15, 2018. She wrote: “Yes, the meteor actually did streak in front of Venus! Only a bit of tweaking on contrast and noise reduction done in Photoshop CC2018.” Fuji X-A1, 18-55mm f2.8 with Tripod, Exif : iso2000, 30″, f2.8. Way to go, Emma!

January 4, 2019 Quadrantids

April 23, 2019 Lyrids

May 5, 2019 Eta Aquariids

Late July, 2019 Delta Aquariids

August 12, 2019 Perseids

October 9, 2019 Draconids

October 21, 2019 Orionids

November 5-6, 2018 South Taurids

November 12-13, 2019 North Taurids

November 18, 2019 Leonids

December 13-14, 2018 Geminids

December 22, 2018 Ursids

A word about moonlight

Most important: a dark sky

Know your dates and times

Where to go to watch a meteor shower

What to bring with you

Are the predictions reliable?

Remember …

Quadrantid radiant composite via Scott MacNeill of Frosty Drew Observatory in Charleston, Rhode Island.

January 4, 2019, before dawn, the Quadrantids
Although the Quadrantids can produce over 100 meteors per hour, the sharp peak of this shower tends to last only a few hours, and doesn’t always come at an opportune time. This year, the the almost-new waning crescent moon will ensure dark skies for this year’s production. Even though moonlight isn’t a factor this year, you still have to be in the right spot on Earth to view this meteor shower in all its splendor. The radiant point is in the part of the sky that used to be considered the constellation Quadrans Muralis the Mural Quadrant. You’ll find this radiant near the famous Big Dipper asterism (chart here), in the north-northeastern sky after midnight and highest up before dawn. Because the radiant is fairly far to the north on the sky’s dome, meteor numbers will be greater at northerly latitudes in the Northern Hemisphere. In 2019, watch in the wee hours – after midnight and before dawn – on January 4. Fortunately, the absence of moonlight provides a big plus for watching this year’s Quadrantid meteor shower.

Everything you need to know: Quadrantid meteor shower

Lyrid meteor on April 21, 2014. Simon Waldram in Fuerteventura, in the Canary Islands, discovered this one as he finished batch editing 320 photos to make a startrail image. Thanks, Simon!

Lyrid meteor in 2014 by Simon Waldram in Fuerteventura in the Canary Islands. He discovered it as he finished batch editing 320 photos to make a startrail image.

April 23, 2019, before dawn, the Lyrids
The Lyrid meteor shower – April’s shooting stars – lasts from about April 16 to 25. About 10 to 15 meteors per hour can be expected around the shower’s peak on a dark, moonless night. Unfortunately, in 2019, the almost-full waning gibbous moon will pretty much wash out this year’s Lyrid meteor shower. The Lyrids are known for uncommon surges that can sometimes bring the rate up to 100 per hour. Those rare outbursts are not easy to predict, but they’re one of the reasons the tantalizing Lyrids are worth checking out. The radiant for this shower is near the bright star Vega in the constellation Lyra (chart here), which rises in the northeast at about 10 p.m. on April evenings. In 2019, we expect the peak viewing hours to take place in the dark hours before dawn April 23, but under the light of a bright waning gibbous moon.

Everything you need to know: Lyrid meteor shower

Long meteor caught during the peak of last week's Eta Aquarid meteor shower, May 6, 2016. Photo by Darla Young.

Long meteor caught during the peak of the May 2016 Eta Aquariid meteor shower, by Darla Young.

May 5, 2019, before dawn, the Eta Aquariids
This meteor shower has a relatively broad maximum – meaning you can watch it the day before and after the predicted peak morning of May 5. This shower favors the Southern Hemisphere, and is often the Southern Hemisphere’s best meteor shower of the year. In 2019, the new moon on May 4 guarantees dark nights for this year’s Eta Aquariid shower. The radiant is near the star Eta in the constellation Aquarius the Water Bearer (click here for chart). The radiant comes over the eastern horizon at about 4 a.m. local time; that is the time at all locations across the globe. For that reason, the hour or two before dawn tends to offer the most Eta Aquariid meteors, no matter where you are on Earth. At northerly latitudes – like those in the northern U.S. and Canada, or northern Europe, for example – the meteor numbers are typically lower for this shower. In the southern half of the U.S., 10 to 20 meteors per hour might be visible in a dark sky. Farther south – for example, at latitudes in the Southern Hemisphere – the meteor numbers may increase dramatically, with perhaps two to three times more Eta Aquariid meteors streaking the southern skies (on a dark, moonless night). For the most part, the Eta Aquariids are a predawn shower. In 2019, the most meteors will probably rain down in the predawn sky on May 5 – in a dark sky unmarred by moonlight! The broad peak to this shower means that some meteors may fly for a few days before and after the predicted optimal date.

Everything you need to know: Eta Aquariid meteor shower

David S. Brown caught this meteor on July 30, 2014, in southwest Wyoming.

Delta Aquariid in 2014, from David S. Brown in southwest Wyoming.

Late July 2019, before dawn, the Delta Aquariids
Like the Eta Aquariids in May, the Delta Aquariid meteor shower in July favors the Southern Hemisphere and tropical latitudes in the Northern Hemisphere. But these meteors can be seen from around the world. This year, fortunately, the new moon on August 1 will provide dark skies, which is especially important, because these faint meteors display very few fireballs or persistent trains. The meteors appear to radiate from near the star Skat or Delta in the constellation Aquarius the Water Bearer. The maximum hourly rate can reach 15 to 20 meteors in a dark sky. The nominal peak is around July 27-30, but, unlike many meteor showers, the Delta Aquariids lack a very definite peak. Instead, these medium-speed meteors ramble along fairly steadily throughout late July and early August. An hour or two before dawn usually presents the most favorable view of the Delta Aquariids. At the shower’s peak in late July 2019, the rather faint Delta Aquariid meteors will not have to contend with moonlight, so this is indeed a favorable year for watching this shower.

Everything you need to know: Delta Aquariid shower

The 2017 Perseid meteor shower peaked in moonlight, but that didn’t stop Hrvoje Crnjak in Šibenik, Croatia, from catching this bright Perseid on the morning of August 12, 2017. Notice the variations in brightness and color throughout, and the little “pop” of brightness toward the bottom. A brightness “pop” like that comes from a clump of vaporizing debris. Thank you, Hrvoje!

Late evening to dawn on August 11, 12 and 13, 2019, the Perseids
The Perseid meteor shower is perhaps the most beloved meteor shower of the year for the Northern Hemisphere. It’s a rich meteor shower, and it’s steady. Best of all, the slender waxing crescent moon will set at early evening, providing deliciously dark skies for this year’s Perseid meteors. These swift and bright meteors radiate from a point in the constellation Perseus the Hero. As with all meteor shower radiant points, you don’t need to know Perseus to watch the shower; instead, the meteors appear in all parts of the sky. These meteors frequently leave persistent trains. Perseid meteors tend to strengthen in number as late night deepens into midnight, and typically produce the most meteors in the wee hours before dawn. In 2019, the peak night of this shower will be marred by the brilliant waxing gibbous moon, although the brighter Perseids will likely overcome the moonlit glare. Predicted peak in 2019: the night of August 12-13, but try the nights before and after, too, from late night until dawn.

All you need to Know: Perseid meteor shower

Draconids near Tucson, Arizona, in 2013, by our friend Sean Parker Photography.

Draconids near Tucson, Arizona, in 2013, by our friend Sean Parker Photography.

October 8 or 9, 2019, nightfall and evening, the Draconids
The radiant point for the Draconid meteor shower almost coincides with the head of the constellation Draco the Dragon in the northern sky. That’s why the Draconids are best viewed from the Northern Hemisphere. The Draconid shower is a real oddity, in that the radiant point stands highest in the sky as darkness falls. That means that, unlike many meteor showers, more Draconids are likely to fly in the evening hours than in the morning hours after midnight. This shower is usually a sleeper, producing only a handful of languid meteors per hour in most years. But watch out if the Dragon awakes! In rare instances, fiery Draco has been known to spew forth many hundreds of meteors in a single hour. In 2019, watch the Draconid meteors at nightfall and early evening on October 8. Try the nights of October 7 and 9, too. Unfortunately, the bright waxing gibbous moon is sure to intrude on this year’s production.

Spectacular Draconids in 2018?

Here is a beautiful aurora, with an Orionid meteor falling above it. Photo taken in 2013 by Tommy Eliassen Photography in Norway.

Orionid meteor with aurora in 2013, by Tommy Eliassen Photography in Norway.

October 22, 2019, before dawn, the Orionids
On a dark, moonless night, the Orionids exhibit a maximum of about 10 to 20 meteors per hour. Unfortunately, in 2019, the moon is just past last quarter and will somewhat obscure this year’s production. More meteors tend to fly after midnight, and the Orionids are typically at their best in the wee hours before dawn. These fast-moving meteors occasionally leave persistent trains. The Orionids sometimes produce bright fireballs, so watch for them to possibly overcome the moonlight. If you trace these meteors backward, they seem to come from the Club of the famous constellation Orion the Hunter. You might know Orion’s bright, ruddy star Betelgeuse. The radiant is north of Betelgeuse. The Orionids have a broad and irregular peak that isn’t easy to predict. This year, 2019, the moonlight will somewhat subdue this year’s Orionid meteor shower. Try in the wee hours before dawn on October 21 and 22, in the light of the waning moon.

Everything you need to know: Orionid meteor shower

View larger. | Jeff Dai in Tibet captured this Taurid fireball on November 10, 2015. He wrote:

In 2015, the Taurids put on a spectacular display of fireballs, which lasted many days. Photographer Jeff Dai captured this one over Yamdrok Lake in Tibet.

Late night November 5 until dawn November 6, 2019, the South Taurids
In 2019, the expected peak night of the South Taurid shower happens a few days after first quarter moon. But peak viewing is just after midnight, at which time the moon will have set or is close to setting. Click here to find out when the moon sets in your sky, remembering to check the moonrise and moonset box. The meteoroid streams that feed the South (and North) Taurids are very spread out and diffuse. The Taurids are extremely long-lasting (September 25 to November 25) but usually don’t offer more than about five meteors per hour. That is true even on the South Taurids’ peak night. The Taurids are, however, well known for having a high percentage of fireballs, or exceptionally bright meteors. Plus, the other Taurid shower – the North Taurids – adds a few more meteors to the mix during the South Taurids’ peak night. Peak viewing for a few hours, centered around 1 a.m. local time on November 5. But the South and North meteors continue to rain down throughout the following week, but with more interference from the waxing gibbous moon!

Late night November 12 until dawn November 13, 2019, the North Taurids
Like the South Taurids, the North Taurids meteor shower is long-lasting (October 12 – December 2) but modest, and the peak number is forecast at about five meteors per hour. Unfortunately, in 2019, the full moon will hamper the show, as it shines all night from dusk till dawn. The North and South Taurids combine to provide a nice sprinkling of meteors throughout October and November. Typically, you see the maximum numbers at around midnight, when Taurus the Bull is highest in the sky. Taurid meteors tend to be slow-moving, but sometimes very bright. In 2019, the predicted peak night is from late night November 12 till dawn November 19, but under the floodlight of the November 2019 full moon.

James Younger sent in this photos during the 2015 peak of the Leonid meteor shower. It's a meteor over the San Juan Islands in the Pacific Northwest, between the U.S. mainland and Vancouver Island, British Columbia. The San Juans are part of the U.S. state of Washington.

James Younger sent in this photo during the 2015 peak of the Leonid meteor shower. It’s a meteor over the San Juan Islands in the Pacific Northwest.

November 18, 2019, before dawn, the Leonids
In 2018, a bright waxing gibbous moon shines almost all night long on the peak night of the Leonid shower! However, the Leonids tend to produce the most meteors in the dark hour before dawn, at which time the moon will have set. (Click here to find out when the moon sets in your sky, remembering to check the moonrise and moonset box.) Radiating from the constellation Leo the Lion, the famous Leonid meteor shower has produced some of the greatest meteor storms in history – at least one in living memory, 1966 – with rates as high as thousands of meteors per minute during a span of 15 minutes on the morning of November 17, 1966. Indeed, on that beautiful night in 1966, the meteors did, briefly, fall like rain. Some who witnessed the 1966 Leonid meteor storm said they felt as if they needed to grip the ground, so strong was the impression of Earth plowing along through space, fording the meteoroid stream. The meteors, after all, were all streaming from a single point in the sky – the radiant point – in this case in the constellation Leo the Lion. Leonid meteor storms sometimes recur in cycles of 33 to 34 years, but the Leonids around the turn of the century – while wonderful for many observers – did not match the shower of 1966. And, in most years, the Lion whimpers rather than roars, producing a maximum of perhaps 10-15 meteors per hour on a dark night. Like many meteor showers, the Leonids ordinarily pick up steam after midnight and display the greatest meteor numbers just before dawn. In 2018, the Leonids are expected to fall most abundantly in the dark hour before dawn on November 17 or 18.

Everything you need to know: Leonid meteor shower

Cynthia Haithcock in Troy, North Carolina caught this Geminid on December 14. Looks like a bright one! She wrote:

Cynthia Haithcock in Troy, North Carolina, caught this Geminid in 2015. Looks like a bright one!

December 13-14, 2019, mid-evening until dawn, Geminids
Radiating from near the bright stars Castor and Pollux in the constellation Gemini the Twins, the Geminid meteor shower is one of the finest meteors showers visible in either the Northern or the Southern Hemisphere. In 2019, the just past full waning gibbous moon staying out for most of the night will bleach out the fainter Geminids. set before the peak viewing hours of the Geminid shower, from late evening until dawn. The meteors are plentiful, rivaling the August Perseids. They are often bold, white and bright. On a dark night, you can often catch 50 or more meteors per hour. The greatest number of meteors fall in the wee hours after midnight, centered around 2 a.m. local time (the time on your clock no matter where you are on Earth), when the radiant point is highest in the sky. In 2019, watch the usually reliable and prolific Geminid meteor shower from mid-evening December 13 until dawn December 14, though in moon-drenched skies.

Everything you need to know: Geminid meteor shower

December 22, 2019, before dawn, the Ursids
Die-hard meteor watchers in the Northern Hemisphere watch for Ursid meteors about a week after the Geminids. This low-key meteor shower is active each year from about December 17 to 26. The Ursids usually peak around the December solstice, perhaps offering 5 to 10 meteors per hour during the predawn hours in a dark sky. This year, in 2019, the waning crescent moon lighting up the morning hours will somewhat intrude on this year’s the Ursid shower.

Ursid shower peaks in moonlight

A word about moonlight. In 2019, moonlight poses no problem for the January Quadrantids and May Eta Aquariids. The moon won’t seriously interfere with the July Delta Aquariids, November South Taurids and December Usurids. Some moon-free time accompanies the August Perseids in the predawn sky. On the other hand, a nearly full moon obstructs the April Lyrids and November South Taurids. Our almanac page provides links for access to the moonrise and moonset times in your sky.

Most important: a dark sky. Here’s the first thing – the main thing – you need to know to become as proficient as the experts at watching meteors. That is, to watch meteors, you need a dark sky. It’s possible to catch a meteor or two or even more from the suburbs. But, to experience a true meteor shower – where you might see several meteors each minute – avoid city lights. EarthSky’s Stargazing page shows dark locations (zoom out for a worldwide view).

Know your dates and times. You also need to be looking on the right date, at the right time of night. Meteor showers occur over a range of dates, because they stem from Earth’s own movement through space. As we orbit the sun, we cross “meteor streams.” These streams of icy particles in space come from comets moving in orbit around the sun. Comets are fragile, icy bodies that litter their orbits with debris. When this cometary debris enters our atmosphere, it vaporizes due to friction with the air. If moonlight or city lights don’t obscure the view, we on Earth see the falling, vaporizing particles as meteors.

Where to go to watch a meteor shower. You can comfortably watch meteors from many places, assuming you have a dark sky: a rural back yard or deck, the hood of your car, the side of a road. State parks and national parks are good bets, but be sure they have a wide open viewing area, like a field; you don’t want to be stuck in the midst of a forest on meteor night. An EarthSky friend, veteran meteor-watcher and astrophotographer Sergio Garcia Rill, also offers this specific advice:

… you might want to give it a try but don’t know where to go. Well, in planning my night photoshoots I use a variety of apps and web pages to know how dark the sky is in a certain location, the weather forecast, and how the night sky will look. Here’s the link to Dark Sky Finder. It’s a website that shows the light pollution in and around cities in North America which has been fundamental for finding dark sites to set up shots. Dark Sky finder also has an app for iPhone and iPad which as of this writting is only 99 cents so you might want to look into that as well. For people not in North America, the Blue Marble Navigator might be able to help to see how bright are the lights near you.

The other tool I can suggest is the Clear Sky Chart. I’ve learned the hard way that, now matter how perfectly dark the sky is at your location, it won’t matter if there’s a layer of clouds between you and the stars. This page is a little hard to read, but it shows a time chart, with each column being an hour, and each row being one of the conditions like cloud coverage and darkness. Alternatively, you could try to see the regular weather forecast at the weather channel or your favorite weather app.

What to bring with you. You don’t need special equipment to watch a meteor shower. If you want to bring along equipment to make yourself more comfortable, consider a blanket or reclining lawn chair, a thermos with a hot drink, binoculars for gazing at the stars. Be sure to dress warmly enough, even in spring or summer, especially in the hours before dawn. Binoculars are fun to have. You won’t need them for watching the meteor shower, but, especially if you have a dark sky, you might not be able to resist pointing them at the starry sky.

Are the predictions reliable? Although astronomers have tried to publish exact predictions in recent years, meteor showers remain notoriously unpredictable. Your best bet is to go outside at the times we suggest, and plan to spend at least an hour, if not a whole night, reclining comfortably while looking up at the sky. Also remember that meteor showers typically don’t just happen on one night. They span a range of dates. So the morning before or after a shower’s peak might be good, too.

Remember … meteor showers are like fishing. You go, you enjoy nature … and sometimes you catch something.

Peak dates are derived from data published in the Observer’s Handbook by the Royal Astronomical Society of Canada and Guy Ottewell’s Astronomical Calendar.

This Geminid meteor is seen coming straight from its radiant point, which is near the two brightest stars in Gemini, Castor and Pollux. Photo taken on the night of December 12-13, 2012, by EarthSky Facebook friend Mike O’Neal in Oklahoma. He said the 2012 Geminid meteor shower was one of the best meteor shows he’s ever seen.

Bottom line: Look here for information about all the major meteor showers between now and the year’s end. There are some good ones!

EarthSky’s top 10 tips for meteor-watchers

Enjoy knowing where to look in the night sky? Please donate to help EarthSky keep going.



from EarthSky http://bit.ly/2F5gC6k

Our top researchers share their ambitions for 2019

We asked some of our top researchers to share their personal ambitions for 2019 and the key trends that they hope to see emerge in their field.

Professor Karen Vousden – Cancer Research UK’s chief scientist 

Professor Karen Vousden has spent the last 30 years in cancer research studying one of the most important molecules in cancer, called p53. She was director of our Beatson Institute in Glasgow from 2003 until two years ago, when she was appointed Cancer Research UK’s chief scientist. In 2019, Vousden is looking forward to understanding more about how altering diet can affect cancer treatment.    

One of the areas we’re interested in is whether we can use defined diets to boost the effectiveness of treatments like chemotherapy. This approach depends on a detailed understanding of how cancer cells feed themselves. Research by us and others has shown that cancer cells are highly dependent on a supply of some amino acids, including one called serine. And we’ve found that we can slow tumour growth in mice given a diet that doesn’t contain this amino acid. Now we’re really interested in trying to move this work into people to see if the same thing applies.  

Professor Karen Vousden

Our ultimate aim is to run a clinical trial testing if a special diet that lacks serine can help patients having chemotherapy, but first we need to test the diet in healthy volunteers. This year we hope to find out if it’s possible to reduce the amount of serine circulating in the body by putting someone on a special diet, as it is in mice. We’ll also be running more experiments with mice to see if this restricted diet has any unexpected impact on the rest of the body, particularly the immune system.   

Beyond my work I’m really excited about what we’ll learn about immunotherapy in 2019. The idea that we can reactivate the body’s ability to detect and kill cancer cells using these new treatments has been a game changer in recent years. But while it’s had astonishing results for some people, others don’t respond at all. So as well as looking to develop new approaches, I hope the next few years will bring a deeper understanding of why only some patients’ cancers respond to this type of treatment.   

Finally, there’s a lot to look forward to at Cancer Research UK. I’m particularly excited by some of the ambitious initiatives that are being set up at the moment. We’re bringing together talented people from around the world and from lots of different areas of science to tackle some of the big questions in cancer research. And that opens up some hugely exciting possibilities. 

We’ll be updating this post throughout the week. Tomorrow, Professor Karl Peggs, a clinician and researcher at University College London, shares what to look out for in immunotherapy in 2019.

Gabi, Katie & Ethan



from Cancer Research UK – Science blog http://bit.ly/2BUby0L

We asked some of our top researchers to share their personal ambitions for 2019 and the key trends that they hope to see emerge in their field.

Professor Karen Vousden – Cancer Research UK’s chief scientist 

Professor Karen Vousden has spent the last 30 years in cancer research studying one of the most important molecules in cancer, called p53. She was director of our Beatson Institute in Glasgow from 2003 until two years ago, when she was appointed Cancer Research UK’s chief scientist. In 2019, Vousden is looking forward to understanding more about how altering diet can affect cancer treatment.    

One of the areas we’re interested in is whether we can use defined diets to boost the effectiveness of treatments like chemotherapy. This approach depends on a detailed understanding of how cancer cells feed themselves. Research by us and others has shown that cancer cells are highly dependent on a supply of some amino acids, including one called serine. And we’ve found that we can slow tumour growth in mice given a diet that doesn’t contain this amino acid. Now we’re really interested in trying to move this work into people to see if the same thing applies.  

Professor Karen Vousden

Our ultimate aim is to run a clinical trial testing if a special diet that lacks serine can help patients having chemotherapy, but first we need to test the diet in healthy volunteers. This year we hope to find out if it’s possible to reduce the amount of serine circulating in the body by putting someone on a special diet, as it is in mice. We’ll also be running more experiments with mice to see if this restricted diet has any unexpected impact on the rest of the body, particularly the immune system.   

Beyond my work I’m really excited about what we’ll learn about immunotherapy in 2019. The idea that we can reactivate the body’s ability to detect and kill cancer cells using these new treatments has been a game changer in recent years. But while it’s had astonishing results for some people, others don’t respond at all. So as well as looking to develop new approaches, I hope the next few years will bring a deeper understanding of why only some patients’ cancers respond to this type of treatment.   

Finally, there’s a lot to look forward to at Cancer Research UK. I’m particularly excited by some of the ambitious initiatives that are being set up at the moment. We’re bringing together talented people from around the world and from lots of different areas of science to tackle some of the big questions in cancer research. And that opens up some hugely exciting possibilities. 

We’ll be updating this post throughout the week. Tomorrow, Professor Karl Peggs, a clinician and researcher at University College London, shares what to look out for in immunotherapy in 2019.

Gabi, Katie & Ethan



from Cancer Research UK – Science blog http://bit.ly/2BUby0L

Has Mars’ methane gone missing?

Artist’s illustration of the ExoMars Trace Gas Orbiter (TGO). So far, TGO has found no methane in the Martian atmosphere, which is puzzling scientists. Image via TG MediaLab/ESA.

One of Mars’ most puzzling mysteries has been the discovery of methane in its atmosphere. This is exciting because, on Earth, methane comes from two primary sources – biology and geology. Mars’ methane has been detected by telescopes on Earth, orbiting spacecraft and rovers. It has been quite well established that the methane is there; the big question is where does it come from? But now there is a new wrinkle in the data. Recent observations by the European Space Agency’s ExoMars Trace Gas Orbiter (TGO) have shown no presence of the methane, even though its instruments are more sensitive to tiny amounts than any of the instruments used previously. The new results were reported in Science on December 12, 2018, with the peer-reviewed paper published the same day. They were also announced at the fall meeting of the American Geophysical Union in Washington, D.C.

The findings prompted an unexpected question – has Mars’ methane gone missing?

TGO is one of two components of the ExoMars mission (the other was a landing module, which crashed on Mars’ surface). TGO began searching the atmosphere for traces of methane earlier this year, after the spacecraft achieved its circular “science” orbit of 250 miles (400 km) above Mars’ surface in April 2018. Two key spectrometers are being used – a Belgian instrument called NOMAD and a Russian one called ACS. They are capable of detecting methane in extremely small amounts – better than other instruments used so far. The scientists were sure they would see some methane, but when they analyzed the data sent back – they saw nothing.

These initial results show no sign of methane down to a very minute level of 50 parts per trillion. The observations scanned most of the atmosphere, going almost all the way down to the surface.

Mars surface with numerous drawings of methane molecules

Diagram depicting possible methane sources (released into atmosphere) and sinks (disappears from atmosphere). Image via NASA/JPL-Caltech/SAM-GSFC/University of Michigan.

Ann Carine Vandaele, NOMAD’s principal investigator and a planetary scientist at the Royal Belgian Institute for Space Aeronomy in Brussels, said that there is still some cleanup to do with the data, adding:

But we already know we can’t see any methane.

So what is happening? The results seem disappointing, certainly, but there are a few things to keep in mind.

The Curiosity rover has detected small amounts of methane on multiple occasions now. Plus, that data indicates the methane is seasonal in that region of Gale Crater, peaking in summer and dwindling again in winter. Curiosity detected a methane spike of seven parts per billion (ppb), which lasted for several months, before finding a seasonal spike of 0.7 ppb. In 2004, the Mars Express orbiter saw a methane spike of 10 ppb.

As Chris Webster, a planetary scientist at the Jet Propulsion Laboratory who leads the methane-sensing instrument on Curiosity noted, it took his team six months to detect the first methane spike and years to find the seasonal background methane cycle. He is optimistic, saying that:

I’m confident that over time there will be a consistency between the two data sets.

Curiosity rover on sandy hillside

The Curiosity rover has detected – multiple times now – small amounts of methane that vary on a seasonal basis. Image via NASA/JPL-Caltech/MSSS.

sine-wave-like cycle diagram

Diagram showing the seasonal cycle of methane as detected by the Curiosity rover in Gale Crater. Image via NASA/JPL-Caltech.

Curiosity actually saw a large seasonal variation in the amount of methane. As noted by Webster:

The thing that’s so shocking here is this large variation. We’re left trying to imagine how we can create this seasonal variation.

The lowest background level of methane that Curiosity detected was 0.4 ppb. The highest levels ever detected so far were by Mike Mumma, a planetary scientist at Goddard Space Flight Center, and his colleagues in 2009. They detected spectral signs of a 45 ppb methane plume using the NASA Infrared Telescope Facility and the twin telescopes at the W.M. Keck Observatory in Hawaii.

There’s another possible positive result in all this. The lack of any methane right now would seem to indicate that it is not coming down through the atmosphere from space, e.g. from comets. That was one possible source of methane that had been considered early on.

That would also be consistent with Curiosity’s findings, that the methane is seasonal and most likely originating from underground sources. According to Webster:

The methane is not coming from above. That’s a big result.

Mars in false color with big red splotches showing high levels of methane

Methane levels in Mars’ northern hemisphere as seen by spectrometers on telescopes in Hawaii in 2012. Image via NASA.

Scientists also think that methane could form from organic carbon that enters the atmosphere with dust, which would react with solar radiation. So where is it?

It is suspected that Gale Crater is probably just one of many locations where methane seeps to the surface. But even if there are thousands, the total amount of methane produced would still be small. According to Sushil Atreya, a planetary scientist at the University of Michigan and a member of the Curiosity science team:

I actually did the calculation. It’s going to average out to be a very, very low value, nondetectable.

Bottom line: The mystery of Mars’ methane just got more puzzling. Why has TGO found no methane yet when other previous missions and observations have? Only further observations will help to answer that question and what the origin of Mars’ methane actually is. Confirmation that the methane originates from Mars itself – most likely underground – would be evidence that Mars is still alive – either geologically or biologically, or both.

Source: Impact of the 2018 global dust storm on Mars atmosphere composition as observed by NOMAD on ExoMars Trace Gas Orbiter (Invited)

Via Science



from EarthSky http://bit.ly/2s2McJz

Artist’s illustration of the ExoMars Trace Gas Orbiter (TGO). So far, TGO has found no methane in the Martian atmosphere, which is puzzling scientists. Image via TG MediaLab/ESA.

One of Mars’ most puzzling mysteries has been the discovery of methane in its atmosphere. This is exciting because, on Earth, methane comes from two primary sources – biology and geology. Mars’ methane has been detected by telescopes on Earth, orbiting spacecraft and rovers. It has been quite well established that the methane is there; the big question is where does it come from? But now there is a new wrinkle in the data. Recent observations by the European Space Agency’s ExoMars Trace Gas Orbiter (TGO) have shown no presence of the methane, even though its instruments are more sensitive to tiny amounts than any of the instruments used previously. The new results were reported in Science on December 12, 2018, with the peer-reviewed paper published the same day. They were also announced at the fall meeting of the American Geophysical Union in Washington, D.C.

The findings prompted an unexpected question – has Mars’ methane gone missing?

TGO is one of two components of the ExoMars mission (the other was a landing module, which crashed on Mars’ surface). TGO began searching the atmosphere for traces of methane earlier this year, after the spacecraft achieved its circular “science” orbit of 250 miles (400 km) above Mars’ surface in April 2018. Two key spectrometers are being used – a Belgian instrument called NOMAD and a Russian one called ACS. They are capable of detecting methane in extremely small amounts – better than other instruments used so far. The scientists were sure they would see some methane, but when they analyzed the data sent back – they saw nothing.

These initial results show no sign of methane down to a very minute level of 50 parts per trillion. The observations scanned most of the atmosphere, going almost all the way down to the surface.

Mars surface with numerous drawings of methane molecules

Diagram depicting possible methane sources (released into atmosphere) and sinks (disappears from atmosphere). Image via NASA/JPL-Caltech/SAM-GSFC/University of Michigan.

Ann Carine Vandaele, NOMAD’s principal investigator and a planetary scientist at the Royal Belgian Institute for Space Aeronomy in Brussels, said that there is still some cleanup to do with the data, adding:

But we already know we can’t see any methane.

So what is happening? The results seem disappointing, certainly, but there are a few things to keep in mind.

The Curiosity rover has detected small amounts of methane on multiple occasions now. Plus, that data indicates the methane is seasonal in that region of Gale Crater, peaking in summer and dwindling again in winter. Curiosity detected a methane spike of seven parts per billion (ppb), which lasted for several months, before finding a seasonal spike of 0.7 ppb. In 2004, the Mars Express orbiter saw a methane spike of 10 ppb.

As Chris Webster, a planetary scientist at the Jet Propulsion Laboratory who leads the methane-sensing instrument on Curiosity noted, it took his team six months to detect the first methane spike and years to find the seasonal background methane cycle. He is optimistic, saying that:

I’m confident that over time there will be a consistency between the two data sets.

Curiosity rover on sandy hillside

The Curiosity rover has detected – multiple times now – small amounts of methane that vary on a seasonal basis. Image via NASA/JPL-Caltech/MSSS.

sine-wave-like cycle diagram

Diagram showing the seasonal cycle of methane as detected by the Curiosity rover in Gale Crater. Image via NASA/JPL-Caltech.

Curiosity actually saw a large seasonal variation in the amount of methane. As noted by Webster:

The thing that’s so shocking here is this large variation. We’re left trying to imagine how we can create this seasonal variation.

The lowest background level of methane that Curiosity detected was 0.4 ppb. The highest levels ever detected so far were by Mike Mumma, a planetary scientist at Goddard Space Flight Center, and his colleagues in 2009. They detected spectral signs of a 45 ppb methane plume using the NASA Infrared Telescope Facility and the twin telescopes at the W.M. Keck Observatory in Hawaii.

There’s another possible positive result in all this. The lack of any methane right now would seem to indicate that it is not coming down through the atmosphere from space, e.g. from comets. That was one possible source of methane that had been considered early on.

That would also be consistent with Curiosity’s findings, that the methane is seasonal and most likely originating from underground sources. According to Webster:

The methane is not coming from above. That’s a big result.

Mars in false color with big red splotches showing high levels of methane

Methane levels in Mars’ northern hemisphere as seen by spectrometers on telescopes in Hawaii in 2012. Image via NASA.

Scientists also think that methane could form from organic carbon that enters the atmosphere with dust, which would react with solar radiation. So where is it?

It is suspected that Gale Crater is probably just one of many locations where methane seeps to the surface. But even if there are thousands, the total amount of methane produced would still be small. According to Sushil Atreya, a planetary scientist at the University of Michigan and a member of the Curiosity science team:

I actually did the calculation. It’s going to average out to be a very, very low value, nondetectable.

Bottom line: The mystery of Mars’ methane just got more puzzling. Why has TGO found no methane yet when other previous missions and observations have? Only further observations will help to answer that question and what the origin of Mars’ methane actually is. Confirmation that the methane originates from Mars itself – most likely underground – would be evidence that Mars is still alive – either geologically or biologically, or both.

Source: Impact of the 2018 global dust storm on Mars atmosphere composition as observed by NOMAD on ExoMars Trace Gas Orbiter (Invited)

Via Science



from EarthSky http://bit.ly/2s2McJz