aads

Most distant massive galaxy cluster

Cluster IDCS 1426, shown here, is the most massive cluster of galaxies yet discovered in the first 4 billion years after the Big Bang. Credit: NASA, European Space Agency, University of Florida, University of Missouri, and University of California

Cluster IDCS 1426, shown here, is the most massive cluster of galaxies yet discovered in the first 4 billion years after the Big Bang. Image via NASA, ESA, U. of Florida, U. of Missouri, and U. of California

A team of astronomers has detected the most massive cluster of galaxies yet discovered in the first 4 billion years after the Big Bang. The sprawling, churning galaxy cluster – which is labeled IDCS J1426.5+3508 (aka IDCS 1426) – is 10 billion light-years from Earth. It may contain thousands of individual galaxies. It’s about 250 trillion times more massive than the sun, or 1,000 times more massive than the Milky Way galaxy. That’s according to new research presented at the 2016 American Astronomical Society (AAS) meeting in Kissimmee, Florida, last week (January 4-7, 2016).

Galaxy clusters are conglomerations of hundreds to thousands of galaxies bound together by gravity. They are the most massive structures in the universe.

The early universe was a chaotic mess of gas and matter that only began to coalesce into distinct galaxies hundreds of millions of years after the Big Bang. Scientists had previously thought that it would take several billion more years for such galaxies to assemble into massive galaxy clusters.

To get a more precise estimate of the galaxy cluster’s mass, Michael McDonald and his colleagues used data from several of NASA’s Great Observatories: the Hubble Space Telescope, the Keck Observatory, and the Chandra X-ray Observatory. Image courtesy of the researchers

To get a more precise estimate of the galaxy cluster’s mass, Michael McDonald and his colleagues used data from the Hubble Space Telescope, the Keck Observatory, and the Chandra X-ray Observatory. Image courtesy of the researchers.

IDCS 1426 appears to be undergoing a substantial amount of upheaval. The researchers observed a bright knot of X-rays, slightly off-center in the cluster, indicating that the cluster’s core may have shifted some hundred thousand light-years from its center.

The scientists believe that the core may have been dislodged from a violent collision with another massive galaxy cluster, causing the gas within the cluster to slosh around, like wine in a glass that has been suddenly moved.

Researcher Michael McDonald, assistant professor of physics and a member of MIT’s Kavli Center for Astrophysics and Space Research, says such a collision may explain how IDCS 1426 formed so quickly in the early universe, at a time when individual galaxies were only beginning to take shape. In an statement from MIT, McDonald said:

In the grand scheme of things, galaxies probably didn’t start forming until the universe was relatively cool, and yet this thing has popped up very shortly after that. Our guess is that another similarly massive cluster came in and sort of wrecked the place up a bit. That would explain why this is so massive and growing so quickly. It’s the first one to the gate, basically.

Galaxy cluster located relatively nearby, such as the Virgo cluster, are extremely bright and easy to spot in the sky. McDonald said:

They are sort of like cities in space, where all these galaxies live very closely together. In the nearby universe, if you look at one galaxy cluster, you’ve basically seen them all. They all look pretty uniform.

The further back you look, the more different they start to appear.

However, finding galaxy clusters that are farther away in space – and further back in time – is difficult and uncertain.

In 2012, scientists using NASA’s Spitzer Space Telescope first detected signs of IDCS 1426 and made some initial estimates of its mass. McDonald said:

We had some sense of how massive and distant it was, but we weren’t fully convinced. These new results are the nail in the coffin that proves that it is what we initially thought.

To get a more precise estimate of the galaxy cluster’s mass, McDonald and his colleagues used data from the Hubble Space Telescope, the Keck Observatory, and the Chandra X-ray Observatory.

Now, the team is looking for individual galaxies within the cluster to get a sense for how such megastructures can form in the early universe. McDonald said:

This cluster is sort of like a construction site. It’s messy, loud, and dirty, and there’s a lot that’s incomplete. By seeing that incompleteness, we can get a sense for how [galaxy clusters] grow.

So far, we’ve confirmed about a dozen or so galaxies, but we’re just seeing the tip of the iceberg, really.

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Bottom line: A team of astronomers have detected sprawling, churning galaxy cluster, named IDCS J1426.5+3508 (or IDCS 1426), 10 billion light years from Earth. The megastructure potentially contains thousands of individual galaxies, and is about 250 trillion times more massive than the sun, or 1,000 times more massive than the Milky Way galaxy. The research was presented at the 2016 American Astronomical Society (AAS) meeting in Kissimmee, Florida, January 4-7, 2016.

Read more from MIT



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Cluster IDCS 1426, shown here, is the most massive cluster of galaxies yet discovered in the first 4 billion years after the Big Bang. Credit: NASA, European Space Agency, University of Florida, University of Missouri, and University of California

Cluster IDCS 1426, shown here, is the most massive cluster of galaxies yet discovered in the first 4 billion years after the Big Bang. Image via NASA, ESA, U. of Florida, U. of Missouri, and U. of California

A team of astronomers has detected the most massive cluster of galaxies yet discovered in the first 4 billion years after the Big Bang. The sprawling, churning galaxy cluster – which is labeled IDCS J1426.5+3508 (aka IDCS 1426) – is 10 billion light-years from Earth. It may contain thousands of individual galaxies. It’s about 250 trillion times more massive than the sun, or 1,000 times more massive than the Milky Way galaxy. That’s according to new research presented at the 2016 American Astronomical Society (AAS) meeting in Kissimmee, Florida, last week (January 4-7, 2016).

Galaxy clusters are conglomerations of hundreds to thousands of galaxies bound together by gravity. They are the most massive structures in the universe.

The early universe was a chaotic mess of gas and matter that only began to coalesce into distinct galaxies hundreds of millions of years after the Big Bang. Scientists had previously thought that it would take several billion more years for such galaxies to assemble into massive galaxy clusters.

To get a more precise estimate of the galaxy cluster’s mass, Michael McDonald and his colleagues used data from several of NASA’s Great Observatories: the Hubble Space Telescope, the Keck Observatory, and the Chandra X-ray Observatory. Image courtesy of the researchers

To get a more precise estimate of the galaxy cluster’s mass, Michael McDonald and his colleagues used data from the Hubble Space Telescope, the Keck Observatory, and the Chandra X-ray Observatory. Image courtesy of the researchers.

IDCS 1426 appears to be undergoing a substantial amount of upheaval. The researchers observed a bright knot of X-rays, slightly off-center in the cluster, indicating that the cluster’s core may have shifted some hundred thousand light-years from its center.

The scientists believe that the core may have been dislodged from a violent collision with another massive galaxy cluster, causing the gas within the cluster to slosh around, like wine in a glass that has been suddenly moved.

Researcher Michael McDonald, assistant professor of physics and a member of MIT’s Kavli Center for Astrophysics and Space Research, says such a collision may explain how IDCS 1426 formed so quickly in the early universe, at a time when individual galaxies were only beginning to take shape. In an statement from MIT, McDonald said:

In the grand scheme of things, galaxies probably didn’t start forming until the universe was relatively cool, and yet this thing has popped up very shortly after that. Our guess is that another similarly massive cluster came in and sort of wrecked the place up a bit. That would explain why this is so massive and growing so quickly. It’s the first one to the gate, basically.

Galaxy cluster located relatively nearby, such as the Virgo cluster, are extremely bright and easy to spot in the sky. McDonald said:

They are sort of like cities in space, where all these galaxies live very closely together. In the nearby universe, if you look at one galaxy cluster, you’ve basically seen them all. They all look pretty uniform.

The further back you look, the more different they start to appear.

However, finding galaxy clusters that are farther away in space – and further back in time – is difficult and uncertain.

In 2012, scientists using NASA’s Spitzer Space Telescope first detected signs of IDCS 1426 and made some initial estimates of its mass. McDonald said:

We had some sense of how massive and distant it was, but we weren’t fully convinced. These new results are the nail in the coffin that proves that it is what we initially thought.

To get a more precise estimate of the galaxy cluster’s mass, McDonald and his colleagues used data from the Hubble Space Telescope, the Keck Observatory, and the Chandra X-ray Observatory.

Now, the team is looking for individual galaxies within the cluster to get a sense for how such megastructures can form in the early universe. McDonald said:

This cluster is sort of like a construction site. It’s messy, loud, and dirty, and there’s a lot that’s incomplete. By seeing that incompleteness, we can get a sense for how [galaxy clusters] grow.

So far, we’ve confirmed about a dozen or so galaxies, but we’re just seeing the tip of the iceberg, really.

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

Bottom line: A team of astronomers have detected sprawling, churning galaxy cluster, named IDCS J1426.5+3508 (or IDCS 1426), 10 billion light years from Earth. The megastructure potentially contains thousands of individual galaxies, and is about 250 trillion times more massive than the sun, or 1,000 times more massive than the Milky Way galaxy. The research was presented at the 2016 American Astronomical Society (AAS) meeting in Kissimmee, Florida, January 4-7, 2016.

Read more from MIT



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Sun behind a storm, in Australia

View larger. | Photo by Murray Fox Photography. Visit him on Facebook.

View larger. | Photo by Murray Fox Photography. Visit him on Facebook.

Murray Fox of Ipswich – a city in southeast Queensland, Australia – posted this photo at EarthSky Facebook this weekend. He captured it on January 10, 2016. He wrote:

Amazing light as the sun was behind this storm this afternoon.

Thank you, Murray!



from EarthSky http://ift.tt/1UIEFFG
View larger. | Photo by Murray Fox Photography. Visit him on Facebook.

View larger. | Photo by Murray Fox Photography. Visit him on Facebook.

Murray Fox of Ipswich – a city in southeast Queensland, Australia – posted this photo at EarthSky Facebook this weekend. He captured it on January 10, 2016. He wrote:

Amazing light as the sun was behind this storm this afternoon.

Thank you, Murray!



from EarthSky http://ift.tt/1UIEFFG

Oh, and we were Gone / Kings of Oblivion [Stoat]

Lay me place and bake me Pie
I’m starving for me Gravy
Leave my shoes, and door unlocked
I might just slip away

Sighing, the swirl through the streets
Like the crust of the sun
The Bewlay Brothers
In our Wings that Bark
Flashing teeth of Brass
Standing tall in the dark
Oh, And we were Gone
Hanging out with your Dwarf Men
We were so turned on
By your lack of conclusions

Something I grew up with; far better than the more recent work as so often, alas. I wouldn’t know how to interpret the lyric of this song other than suggesting that there are layers of ghosts within it”.

Refs

* Fat Bottomed Girls: “I’ve been singing with my band / Across the water, across the land / I’ve seen every blue eyed floozy on the way / But their beauty and their style / Went kind of smooth after a while / Take me to them naughty ladies every time”



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Lay me place and bake me Pie
I’m starving for me Gravy
Leave my shoes, and door unlocked
I might just slip away

Sighing, the swirl through the streets
Like the crust of the sun
The Bewlay Brothers
In our Wings that Bark
Flashing teeth of Brass
Standing tall in the dark
Oh, And we were Gone
Hanging out with your Dwarf Men
We were so turned on
By your lack of conclusions

Something I grew up with; far better than the more recent work as so often, alas. I wouldn’t know how to interpret the lyric of this song other than suggesting that there are layers of ghosts within it”.

Refs

* Fat Bottomed Girls: “I’ve been singing with my band / Across the water, across the land / I’ve seen every blue eyed floozy on the way / But their beauty and their style / Went kind of smooth after a while / Take me to them naughty ladies every time”



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See the Unicorn on dark January nights

For you moon watchers! At dusk, look westward for the slender waxing crescent moon. The green line depicts the ecliptic - the moon's monthly pathway in front of the constellations of the Zodiac.

For you moon watchers! At dusk, look westward for the slender waxing crescent moon. The green line depicts the ecliptic – the moon’s monthly pathway in front of the constellations of the Zodiac.

You’ll need a very dark sky to see the constellation Monoceros the Unicorn in the sky on these cold winter nights. Although a slender waxing crescent moon lights up the southwest sky at dusk and nightfall, it’ll set at relatively early evening. Monceros will be out nearly all night long. Monceros will be higher up and easier to see in the later evening hours.

Let’s find the Unicorn, which comes out at nightfall. Focus in on the bright stars Betelgeuse, Sirius and Procyon (see charts on this page). They make a triangle, which is sometimes called the Winter Triangle. Within this triangle of stars, hidden in between the many bright and glittering stars and constellations visible at this time of year, there’s a constellation that’s as elusive in our night sky as its namesake is in countless fairy tales.

This is the constellation Monoceros the Unicorn. Once again, you will need a very dark sky to see it.

Sky chart of the constellation Monoceros the Unicorn. Click here for a larger chart

M50 image from The Munich Astro Archive

M50 is an open cluster in the constellation Monoceros. Image via The Munich Astro Archive

Like all of the night sky, the region of the heavens around Monoceros holds interest. The winter Milky Way runs through here, so it’s a good place to scan with binoculars.

With binoculars, you can see star clusters here. Those with dark skies might try drawing an imaginary line from the star Sirius to Procyon. About a third of the way along this line, you’ll find a hazy object – an open star cluster – called M50.

You need a telescope to see M50 clearly. But, with an ordinary pair of binoculars, this cluster of stars is wonderful to glimpse and contemplate on a winter night. There are really about 100 stars in the little patch we know as M50. The main part of the cluster is about 10 light-years across. The entire cluster is located some 3,000 light-years from us.

Bottom line: Treat yourself to a visit with a mythical beast – Monoceros the Unicorn – in the January evening sky.

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



from EarthSky http://ift.tt/1sUr0lW
For you moon watchers! At dusk, look westward for the slender waxing crescent moon. The green line depicts the ecliptic - the moon's monthly pathway in front of the constellations of the Zodiac.

For you moon watchers! At dusk, look westward for the slender waxing crescent moon. The green line depicts the ecliptic – the moon’s monthly pathway in front of the constellations of the Zodiac.

You’ll need a very dark sky to see the constellation Monoceros the Unicorn in the sky on these cold winter nights. Although a slender waxing crescent moon lights up the southwest sky at dusk and nightfall, it’ll set at relatively early evening. Monceros will be out nearly all night long. Monceros will be higher up and easier to see in the later evening hours.

Let’s find the Unicorn, which comes out at nightfall. Focus in on the bright stars Betelgeuse, Sirius and Procyon (see charts on this page). They make a triangle, which is sometimes called the Winter Triangle. Within this triangle of stars, hidden in between the many bright and glittering stars and constellations visible at this time of year, there’s a constellation that’s as elusive in our night sky as its namesake is in countless fairy tales.

This is the constellation Monoceros the Unicorn. Once again, you will need a very dark sky to see it.

Sky chart of the constellation Monoceros the Unicorn. Click here for a larger chart

M50 image from The Munich Astro Archive

M50 is an open cluster in the constellation Monoceros. Image via The Munich Astro Archive

Like all of the night sky, the region of the heavens around Monoceros holds interest. The winter Milky Way runs through here, so it’s a good place to scan with binoculars.

With binoculars, you can see star clusters here. Those with dark skies might try drawing an imaginary line from the star Sirius to Procyon. About a third of the way along this line, you’ll find a hazy object – an open star cluster – called M50.

You need a telescope to see M50 clearly. But, with an ordinary pair of binoculars, this cluster of stars is wonderful to glimpse and contemplate on a winter night. There are really about 100 stars in the little patch we know as M50. The main part of the cluster is about 10 light-years across. The entire cluster is located some 3,000 light-years from us.

Bottom line: Treat yourself to a visit with a mythical beast – Monoceros the Unicorn – in the January evening sky.

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



from EarthSky http://ift.tt/1sUr0lW

“Transparency” should not mean a license to harass scientists [Respectful Insolence]

While perusing the New York Times over the weekend, I was disturbed to see an article by Paul D. Thacker that basically advocated using the Freedom of Information Act (FOIA) to request e-mails from scientists in search of undisclosed industry ties. The article was entitled, disturbingly, Scientists, Give Up Your Emails. Thacker, as you might recall, wrote a highly biased article with Charles Seife for PLoS One attacking scientists who work on and defend genetically modified organisms (GMOs) and foods made from them from pseudoscientific attacks by cranks like Vani Hari, better known as The Food Babe. It was an article that was ultimately retracted. Reviewing his articles, not just the retracted PLoS One article, but his most recent NYT article, I find it hard not to conclude that Thacker advocates the unfettered use of FOIA requests, even abusive ones, to go on fishing expeditions for undisclosed conflicts of interest (COIs), real or imagined. Basically, to Thacker, if scientists not engaged in any wrongdoing get hurt (like Folta), that’s just tough doodie. This became clear to me when I saw a Twitter exchange involving Thacker about his article (more on that later).

A bit of background is in order regarding why I care about this. A couple of months ago, I wrote about what I called a sad day for science advocacy. It was such a sad day because a staunch advocate for the science of genetically modified organisms (GMOs) against the pseudoscience and fear mongering that GMO opponents use, publicly announced that he was withdrawing from public advocacy. This public advocate was Kevin Folta, a food and agricultural science professor at the University of Florida. Indeed, it’s not for nothing that I describe anti-GMO activists as using the same fallacious arguments as the antivaccine movement. For his efforts, Folta had endured incredible harassment at the hands of anti-GMO activists, who labeled him a Monsanto shill and did their very best to intimidate him into silence.

The harassment reached its climax last year when US Right to Know (USRTK)—a nonprofit that sells itself as “dedicated” to exposing “the failures of the corporate food system“—hit Folta with a frivolous Freedom of Information Act (FOIA) request that was clearly meant as a fishing expedition and a means of punishing Folta. What was less reported was that USRTK is a lobbying arm of the Organic Consumers Association (OCA), which funded it to the tune of $194,500 thus far. The OCA appears to be USRTK’s only major donor. So basically, an industry that stands to benefit by demonizing GMOs used FOIA to harass scientists thusly:

The request is a response to public arguments by Folta that genetically modified foods are safe. Folta compares the strength of the scientific consensus on GM safety to the consensus on climate change and vaccines, and US Right to Know—or USRTK—believes the food and agricultural industries may be pressuring Folta and other scientists into voicing such arguments.

On January 28, US Right to Know sent out a FOIA request targeting 14 scientists at four universities, including Folta, requesting that they all turn over their email correspondence with industry representatives. Gary Ruskin, the executive director of USRTK, says the move is essential for uncovering the food industry’s efforts to manipulate scientists into advancing pro-genetically-modified propaganda.

One notes that the scientists had a truly difficult choice when confronted with such an FOIA: Submit all of their emails and allow lawyers to sift through them independently, or spend hours doing it themselves alongside legal counsel. Of course, that’s the point. That’s why groups like USRTK make such FOIA. It’s a feature, not a bug, of such requests. If the cranks find something they can use to smear the target, so much the better, but even if they don’t they will have caused their target major headaches and have wasted many hours of their time, hours when they can’t be doing research or public science advocacy. As Steve Novella noted, it’s a win-win strategy for groups like USRTK. Even better, if the scientists push back or complain about an invasion of privacy, those complaints and any resistance to providing the e-mails can be spun as “evidence” of a coverup, with help from even crankier cranks like Mike Adams.

In this case, USRTK did find something that its director Gary Ruskin could spin negatively. It turns out that the University of Florida accepted a small unrestricted grant ($25,000) from Monsanto, to be used to pay for travel expenses, meals, and other minor expenses associated with public outreach. In medicine, for example, this is not an uncommon sort of grant from companies, be they pharmaceutical companies or other companies, and “unrestricted” means just that: The company giving the grant provides the funds for the the institution receiving them to use without preconditions. The finding resulted in unfavorable coverage in the NYT that was criticized for bias. For example, the main scientific critic of Folta’s interviews, Charles Benbrook, is funded by the organic food industry, which was quickly countered with an observation that “the biotech industry has published dozens of articles, under the names of prominent academics, that in some cases were drafted by industry consultants,” as if that makes Benbrook’s bias excusable. (Two wrongs don’t make a right, or make a biased scientist like Benbrook any more credible.)

I will say something right here. Folta did screw up. A lot of us skeptics circling the wagons are reluctant to admit that. I was reluctant to admit that. I now realize that he did, but I think he did it more out of naïveté than out of any intent to hide anything. If he had simply said that his university had that unrestricted grant and that he had accessed some of its funs, the cranks would have still attacked him but there wouldn’t have been even a hint of an appearance of impropriety. Unfortunately, all it takes to ruin one’s reputation sometimes is appearance

Those of us in medicine know that we fail to avoid such appearances at our peril, which is why we must disclose any funds received from a pharmaceutical company, no matter how small and no matter how innocuous. That’s why I not infrequently point out that I once received a one time grant from Bayer for £40,000 for a small research project. (That wasn’t even enough to pay for a postdoc for a year.) I also received $12,000 back in the 1990s from Rhône-Poulenc (which no longer exists as an independent company) as part of a payout for a patent I had with my PhD thesis advisor, who was fair enough to include me because I did much of the work even though he wasn’t strictly obligated to. I also learned that, even if you do disclose everything, cranks can try to paint you as having an undisclosed COI, as Jake Crosby did five years ago when, because my university had a grant from Sanofi-Aventis (which I had nothing to do with) and I was doing research on what was then a Sanofi-Aventis drug (but is no more) it meant that I was in the pocket of vaccine manufacturers.

When you work in a field where cranks are looking for anything they can find that they can turn against you, that’s what you have to do.

Even realizing that cranks are waiting, ready to pounce, there was no excuse for what cranks did with the information culled by USRTK. Nor was there an excuse for the threats that Folta endured or the publication of his home address to intimidate him. As I pointed out at the time, I’ve learned that the tactics used by various anti-science cranks, be they antivaccinationists, quacks, anthropogenic global climate change denialists, or anti-GMO activists, are often similar and often include targeting their opponents at their jobs. If harassment at work doesn’t work, maybe frivolous harassing FOIA requests will.

There is a serious issue here. Much of this research is paid for by public money, through government grants, and/or carried out at public universities. If you’re a scientist at a public university, you’re pretty much wide open to FOIA requests. If you’re at a private university you might still be open to them if you receive federal funding. In any case, there is a case to be made for transparency. The question boils down to the specifics, how much transparency and what is the balance between the privacy of what scientists discuss via e-mail compared to the public’s right to know. Personally, I tend to treat e-mails in my university e-mail account as though they could be subject to FOIA at any minute, which no doubt sometimes inhibits what I write even just on the off chance of embarrassment if I say something stupid or let my tendency towards—shall we say?—insolence run a little too free.

If you want an idea of where Thacker is coming from, all you have to do is to look at this paragraph from his NYT article:

One of our examples focused on a small nonprofit, U.S. Right to Know, which advocates for the labeling of food containing genetically modified organisms. The group filed Freedom of Information requests seeking the correspondence of scientists at public universities, some of whom wrote for a website backed by the agrochemical industry.

Notice what Thacker left out: the fact that USRTK is basically a propaganda organization paid for by the organic crop industry. This is something that is not even in contention. Even if it were, if Thacker were truly interested in “transparency” rather than biased advocacy, he would have mentioned that USRTK is heavily funded by the organic industry just for that reason.

Not surprisingly, he was called out on Twitter by Alan Levinovitz for having left that little bit of critical information out. Basically, Levinovitz pointed out that USRTK is funded by the organic industry. Thacker replied:

When Levinovitz persisted—civilly, I might add—Thacker blocked him:

If it’s true that the NYT editor didn’t think it important to point out in an article advocating that scientists “give up their e-mails” in the name of transparency that the funding source of the group who filed an FOIA used as an example to argue for such “transparency” was a group who would benefit from disclosure of those e-mails, then that’s bias on the NYT’s part. If Thacker didn’t fight to include that information, then that just reveals the bias on his part. To him, it doesn’t appear to be about “transparency” but about attacking scientists who defend GMOs, like Kevin Folta. Basically, I call BS on Thacker’s excuse, and his blocking Levinovitz shows a disturbing unwillingness to engage with critics.

He also shows a disturbing lack of concern for the fallout:

As interest groups on both the left and right increasingly try to politicize the scientific process, there’s little question that there will be misuse of the Freedom of Information laws that some journalists and watchdog organizations have used to uncover wrongdoing.

Scientists have been harassed in the past and no doubt will continue to be harassed in the future, just like other public servants. You can argue that Mr. Smith’s broadsides against NOAA are a case in point. In turn, scientists are free to fight these information requests or seek to narrow the scope of the inquiries to protect against what they believe threatens the integrity of the scientific process or chills research.

But the harassment argument should not be used as an excuse to bar access to scientific research that the public is paying for and has a legitimate interest in seeing.

Of course, no one is saying that harassment should be used as an “excuse” to bar access to scientific research. No one. What is being expressed is concern about balancing the public’s right to know with the potential for the harassment of scientists. Remember, in Folta’s case, the harassment went beyond just making him give up his e-mails. It involved dissemination of his e-mails in such a manner as to guarantee that cranks would harass him at home and even harass his family. Given how utterly predictable such a consequence of releasing those e-mails was, I do not believe for a minute denials on the part of Ruskin or Thacker that they didn’t know or had no way of predicting.

Thacker’s attitude is also chillingly blithe. Dealing with legal actions is not something most people have experience with, including scientists. While lawyers and lobbyists, who deal with legal challenges all the time, might think them no big deal, the average person will be subject to enormous stress when they learn they’re at the receiving end of a legal action. The thought of having to go to court to fight to narrow a FOIA request or fight these frivolous and harassing FOIA requests is a big deal, even if the scientists’ universities are paying for it. The cranks making these FOIA requests know this. They’re counting on it. Again, that’s a feature of these requests, not a bug. Similarly, while complying with such requests is onerous, fighting them is even more onerous, particularly given that the scientist could lose and still have to go through all the work of complying anyway in addition to the work of fighting the requests.

Some of the commenters took Thacker to task for the one-sidedness of Thacker’s article. A common theme (one I agree with) is that his call for “transparency” would be more convincing and easier to take if the same standard were applied to, for instance, Representative Lamar Smith. His harassment of climate scientists would be put very much in context if members of the public could request his e-mail exchanges with donors, energy industry officials, and the like. Or, as another commenter quipped:

Finally, why focus on scientists for this e-mail trawl? Why not all government employees? I for one want to see all of Paul D. Thacker’s e-mails from the time he worked for the US Senate. Don’t worry, it isn’t malicious– it is for transparency.

Indeed. Perhaps some FOIA requests are indicated here. Transparency, you know. Of course, scientists like myself, who work for state universities, already know our e-mails could be subject to FOIA requests. Indeed, I’m rather surprised that I’ve not yet been subject to such a request by antivaccine loons. Of course, because I do my best to keep my blogging activities separate from my work, such a request would be pretty pointless. All my blog e-mail goes through either a Gmail account or one of my private e-mail accounts.

Another pointed out:

Launching an investigation into scientists’ correspondence without having beforehand evaluated the research on its own merit is indeed a politically motivated witch-hunt, and one that ought to be resisted.

Which is quite correct.
Others pointed out (quite rightly) that if you knew your e-mails were open to anyone you’d write a lot less in them and make more phone calls. As a result, there would be less candor in e-mails and research would suffer. Basically, as one commenter pointed out, we shouldn’t allow fishing expeditions going after scientists’ e-mails any more than we allow fishing expeditions in a court of law. Thacker doesn’t see it that way:

I don’t agree.

There are certainly legitimate reasons for scientists’ e-mails, but there really do need to be reasonable limits to protect scientists from the sort of abusive fishing expeditions to which Folta and other agricultural scientists or climate scientists have been subjected. In the end, I couldn’t help but read Thacker’s article as being extremely disingenuous and self-serving as it downplayed the costs of allowing unfettered FOIA-facilitated harassment of scientists as merely the cost of receiving government funding for science or working for the government. There needs to be a balance. I don’t claim to know what that balance should be, but I do claim that Thacker’s way goes too far. His “transparency” is a license to harass.



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While perusing the New York Times over the weekend, I was disturbed to see an article by Paul D. Thacker that basically advocated using the Freedom of Information Act (FOIA) to request e-mails from scientists in search of undisclosed industry ties. The article was entitled, disturbingly, Scientists, Give Up Your Emails. Thacker, as you might recall, wrote a highly biased article with Charles Seife for PLoS One attacking scientists who work on and defend genetically modified organisms (GMOs) and foods made from them from pseudoscientific attacks by cranks like Vani Hari, better known as The Food Babe. It was an article that was ultimately retracted. Reviewing his articles, not just the retracted PLoS One article, but his most recent NYT article, I find it hard not to conclude that Thacker advocates the unfettered use of FOIA requests, even abusive ones, to go on fishing expeditions for undisclosed conflicts of interest (COIs), real or imagined. Basically, to Thacker, if scientists not engaged in any wrongdoing get hurt (like Folta), that’s just tough doodie. This became clear to me when I saw a Twitter exchange involving Thacker about his article (more on that later).

A bit of background is in order regarding why I care about this. A couple of months ago, I wrote about what I called a sad day for science advocacy. It was such a sad day because a staunch advocate for the science of genetically modified organisms (GMOs) against the pseudoscience and fear mongering that GMO opponents use, publicly announced that he was withdrawing from public advocacy. This public advocate was Kevin Folta, a food and agricultural science professor at the University of Florida. Indeed, it’s not for nothing that I describe anti-GMO activists as using the same fallacious arguments as the antivaccine movement. For his efforts, Folta had endured incredible harassment at the hands of anti-GMO activists, who labeled him a Monsanto shill and did their very best to intimidate him into silence.

The harassment reached its climax last year when US Right to Know (USRTK)—a nonprofit that sells itself as “dedicated” to exposing “the failures of the corporate food system“—hit Folta with a frivolous Freedom of Information Act (FOIA) request that was clearly meant as a fishing expedition and a means of punishing Folta. What was less reported was that USRTK is a lobbying arm of the Organic Consumers Association (OCA), which funded it to the tune of $194,500 thus far. The OCA appears to be USRTK’s only major donor. So basically, an industry that stands to benefit by demonizing GMOs used FOIA to harass scientists thusly:

The request is a response to public arguments by Folta that genetically modified foods are safe. Folta compares the strength of the scientific consensus on GM safety to the consensus on climate change and vaccines, and US Right to Know—or USRTK—believes the food and agricultural industries may be pressuring Folta and other scientists into voicing such arguments.

On January 28, US Right to Know sent out a FOIA request targeting 14 scientists at four universities, including Folta, requesting that they all turn over their email correspondence with industry representatives. Gary Ruskin, the executive director of USRTK, says the move is essential for uncovering the food industry’s efforts to manipulate scientists into advancing pro-genetically-modified propaganda.

One notes that the scientists had a truly difficult choice when confronted with such an FOIA: Submit all of their emails and allow lawyers to sift through them independently, or spend hours doing it themselves alongside legal counsel. Of course, that’s the point. That’s why groups like USRTK make such FOIA. It’s a feature, not a bug, of such requests. If the cranks find something they can use to smear the target, so much the better, but even if they don’t they will have caused their target major headaches and have wasted many hours of their time, hours when they can’t be doing research or public science advocacy. As Steve Novella noted, it’s a win-win strategy for groups like USRTK. Even better, if the scientists push back or complain about an invasion of privacy, those complaints and any resistance to providing the e-mails can be spun as “evidence” of a coverup, with help from even crankier cranks like Mike Adams.

In this case, USRTK did find something that its director Gary Ruskin could spin negatively. It turns out that the University of Florida accepted a small unrestricted grant ($25,000) from Monsanto, to be used to pay for travel expenses, meals, and other minor expenses associated with public outreach. In medicine, for example, this is not an uncommon sort of grant from companies, be they pharmaceutical companies or other companies, and “unrestricted” means just that: The company giving the grant provides the funds for the the institution receiving them to use without preconditions. The finding resulted in unfavorable coverage in the NYT that was criticized for bias. For example, the main scientific critic of Folta’s interviews, Charles Benbrook, is funded by the organic food industry, which was quickly countered with an observation that “the biotech industry has published dozens of articles, under the names of prominent academics, that in some cases were drafted by industry consultants,” as if that makes Benbrook’s bias excusable. (Two wrongs don’t make a right, or make a biased scientist like Benbrook any more credible.)

I will say something right here. Folta did screw up. A lot of us skeptics circling the wagons are reluctant to admit that. I was reluctant to admit that. I now realize that he did, but I think he did it more out of naïveté than out of any intent to hide anything. If he had simply said that his university had that unrestricted grant and that he had accessed some of its funs, the cranks would have still attacked him but there wouldn’t have been even a hint of an appearance of impropriety. Unfortunately, all it takes to ruin one’s reputation sometimes is appearance

Those of us in medicine know that we fail to avoid such appearances at our peril, which is why we must disclose any funds received from a pharmaceutical company, no matter how small and no matter how innocuous. That’s why I not infrequently point out that I once received a one time grant from Bayer for £40,000 for a small research project. (That wasn’t even enough to pay for a postdoc for a year.) I also received $12,000 back in the 1990s from Rhône-Poulenc (which no longer exists as an independent company) as part of a payout for a patent I had with my PhD thesis advisor, who was fair enough to include me because I did much of the work even though he wasn’t strictly obligated to. I also learned that, even if you do disclose everything, cranks can try to paint you as having an undisclosed COI, as Jake Crosby did five years ago when, because my university had a grant from Sanofi-Aventis (which I had nothing to do with) and I was doing research on what was then a Sanofi-Aventis drug (but is no more) it meant that I was in the pocket of vaccine manufacturers.

When you work in a field where cranks are looking for anything they can find that they can turn against you, that’s what you have to do.

Even realizing that cranks are waiting, ready to pounce, there was no excuse for what cranks did with the information culled by USRTK. Nor was there an excuse for the threats that Folta endured or the publication of his home address to intimidate him. As I pointed out at the time, I’ve learned that the tactics used by various anti-science cranks, be they antivaccinationists, quacks, anthropogenic global climate change denialists, or anti-GMO activists, are often similar and often include targeting their opponents at their jobs. If harassment at work doesn’t work, maybe frivolous harassing FOIA requests will.

There is a serious issue here. Much of this research is paid for by public money, through government grants, and/or carried out at public universities. If you’re a scientist at a public university, you’re pretty much wide open to FOIA requests. If you’re at a private university you might still be open to them if you receive federal funding. In any case, there is a case to be made for transparency. The question boils down to the specifics, how much transparency and what is the balance between the privacy of what scientists discuss via e-mail compared to the public’s right to know. Personally, I tend to treat e-mails in my university e-mail account as though they could be subject to FOIA at any minute, which no doubt sometimes inhibits what I write even just on the off chance of embarrassment if I say something stupid or let my tendency towards—shall we say?—insolence run a little too free.

If you want an idea of where Thacker is coming from, all you have to do is to look at this paragraph from his NYT article:

One of our examples focused on a small nonprofit, U.S. Right to Know, which advocates for the labeling of food containing genetically modified organisms. The group filed Freedom of Information requests seeking the correspondence of scientists at public universities, some of whom wrote for a website backed by the agrochemical industry.

Notice what Thacker left out: the fact that USRTK is basically a propaganda organization paid for by the organic crop industry. This is something that is not even in contention. Even if it were, if Thacker were truly interested in “transparency” rather than biased advocacy, he would have mentioned that USRTK is heavily funded by the organic industry just for that reason.

Not surprisingly, he was called out on Twitter by Alan Levinovitz for having left that little bit of critical information out. Basically, Levinovitz pointed out that USRTK is funded by the organic industry. Thacker replied:

When Levinovitz persisted—civilly, I might add—Thacker blocked him:

If it’s true that the NYT editor didn’t think it important to point out in an article advocating that scientists “give up their e-mails” in the name of transparency that the funding source of the group who filed an FOIA used as an example to argue for such “transparency” was a group who would benefit from disclosure of those e-mails, then that’s bias on the NYT’s part. If Thacker didn’t fight to include that information, then that just reveals the bias on his part. To him, it doesn’t appear to be about “transparency” but about attacking scientists who defend GMOs, like Kevin Folta. Basically, I call BS on Thacker’s excuse, and his blocking Levinovitz shows a disturbing unwillingness to engage with critics.

He also shows a disturbing lack of concern for the fallout:

As interest groups on both the left and right increasingly try to politicize the scientific process, there’s little question that there will be misuse of the Freedom of Information laws that some journalists and watchdog organizations have used to uncover wrongdoing.

Scientists have been harassed in the past and no doubt will continue to be harassed in the future, just like other public servants. You can argue that Mr. Smith’s broadsides against NOAA are a case in point. In turn, scientists are free to fight these information requests or seek to narrow the scope of the inquiries to protect against what they believe threatens the integrity of the scientific process or chills research.

But the harassment argument should not be used as an excuse to bar access to scientific research that the public is paying for and has a legitimate interest in seeing.

Of course, no one is saying that harassment should be used as an “excuse” to bar access to scientific research. No one. What is being expressed is concern about balancing the public’s right to know with the potential for the harassment of scientists. Remember, in Folta’s case, the harassment went beyond just making him give up his e-mails. It involved dissemination of his e-mails in such a manner as to guarantee that cranks would harass him at home and even harass his family. Given how utterly predictable such a consequence of releasing those e-mails was, I do not believe for a minute denials on the part of Ruskin or Thacker that they didn’t know or had no way of predicting.

Thacker’s attitude is also chillingly blithe. Dealing with legal actions is not something most people have experience with, including scientists. While lawyers and lobbyists, who deal with legal challenges all the time, might think them no big deal, the average person will be subject to enormous stress when they learn they’re at the receiving end of a legal action. The thought of having to go to court to fight to narrow a FOIA request or fight these frivolous and harassing FOIA requests is a big deal, even if the scientists’ universities are paying for it. The cranks making these FOIA requests know this. They’re counting on it. Again, that’s a feature of these requests, not a bug. Similarly, while complying with such requests is onerous, fighting them is even more onerous, particularly given that the scientist could lose and still have to go through all the work of complying anyway in addition to the work of fighting the requests.

Some of the commenters took Thacker to task for the one-sidedness of Thacker’s article. A common theme (one I agree with) is that his call for “transparency” would be more convincing and easier to take if the same standard were applied to, for instance, Representative Lamar Smith. His harassment of climate scientists would be put very much in context if members of the public could request his e-mail exchanges with donors, energy industry officials, and the like. Or, as another commenter quipped:

Finally, why focus on scientists for this e-mail trawl? Why not all government employees? I for one want to see all of Paul D. Thacker’s e-mails from the time he worked for the US Senate. Don’t worry, it isn’t malicious– it is for transparency.

Indeed. Perhaps some FOIA requests are indicated here. Transparency, you know. Of course, scientists like myself, who work for state universities, already know our e-mails could be subject to FOIA requests. Indeed, I’m rather surprised that I’ve not yet been subject to such a request by antivaccine loons. Of course, because I do my best to keep my blogging activities separate from my work, such a request would be pretty pointless. All my blog e-mail goes through either a Gmail account or one of my private e-mail accounts.

Another pointed out:

Launching an investigation into scientists’ correspondence without having beforehand evaluated the research on its own merit is indeed a politically motivated witch-hunt, and one that ought to be resisted.

Which is quite correct.
Others pointed out (quite rightly) that if you knew your e-mails were open to anyone you’d write a lot less in them and make more phone calls. As a result, there would be less candor in e-mails and research would suffer. Basically, as one commenter pointed out, we shouldn’t allow fishing expeditions going after scientists’ e-mails any more than we allow fishing expeditions in a court of law. Thacker doesn’t see it that way:

I don’t agree.

There are certainly legitimate reasons for scientists’ e-mails, but there really do need to be reasonable limits to protect scientists from the sort of abusive fishing expeditions to which Folta and other agricultural scientists or climate scientists have been subjected. In the end, I couldn’t help but read Thacker’s article as being extremely disingenuous and self-serving as it downplayed the costs of allowing unfettered FOIA-facilitated harassment of scientists as merely the cost of receiving government funding for science or working for the government. There needs to be a balance. I don’t claim to know what that balance should be, but I do claim that Thacker’s way goes too far. His “transparency” is a license to harass.



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Sunday Chess Problem [EvolutionBlog]

I picked a charming helpmate for you this week, composed by Edgar Holladay in 1978. He was especially well known for lightweight problems where the pieces formed a recognizable shape on the board. This one looks roughly like an arrow. The stipulation calls for helpmate in eight:



Remember that in a helpmate black and white work together to construct a position in which black is checkmated. Also, black moves first. So you are looking for a sequence eight moves long, staring with black’s first move and ending with white’s eighth move, that ends with black being mated. Also, the move order must be completely forced. If even two moves can be played in a different order, then the whole problem must be discarded as unsound.

Especially in longer helpmates, paying attention to why the move order is forced is usually part of the charm of the problem. You might want to have a go at solving this one. Try to envision what the final position must be, and then work out what needs to happen to get there.

With this problem we have the return of Allumwandlung, which refers to a problem in which all four possible promotions occur in one problem. It is remarkable that a setting with only kings and pawns can feature a unique, delicate solution.

Plainly white will have to give mate with his pawn. Given how boxed in the white king is, he plainly will not be able to march king and pawn to the other side of the board in just eight moves. The board seems too empty to try to get black mated in the center. So that just leaves the white pawn marching down the board and promoting. Since that will require nearly all of white’s moves, black will both have to make sure that the white pawn has the captures it needs available to it, and also to make sure that his own king has no flight squares at the end.

Thinking along these lines might lead you to the idea of getting the white pawn to make a queen on c8, while black uses a promoted rook to block a7. And it turns out that’s doable! Here we go:

1. f1B Kg1 2.e1N Kh1:



3. Nf3 gxf3 4. d1R fxe4



5. Ra1 exd5 6. Ra7 d6



7. Ba6 d7 8. Bc8 dxc8Q mate



Pretty neat! This is one of those problems that feels more like a discovery than a composition. See you next week!



from ScienceBlogs http://ift.tt/1RERUbc

I picked a charming helpmate for you this week, composed by Edgar Holladay in 1978. He was especially well known for lightweight problems where the pieces formed a recognizable shape on the board. This one looks roughly like an arrow. The stipulation calls for helpmate in eight:



Remember that in a helpmate black and white work together to construct a position in which black is checkmated. Also, black moves first. So you are looking for a sequence eight moves long, staring with black’s first move and ending with white’s eighth move, that ends with black being mated. Also, the move order must be completely forced. If even two moves can be played in a different order, then the whole problem must be discarded as unsound.

Especially in longer helpmates, paying attention to why the move order is forced is usually part of the charm of the problem. You might want to have a go at solving this one. Try to envision what the final position must be, and then work out what needs to happen to get there.

With this problem we have the return of Allumwandlung, which refers to a problem in which all four possible promotions occur in one problem. It is remarkable that a setting with only kings and pawns can feature a unique, delicate solution.

Plainly white will have to give mate with his pawn. Given how boxed in the white king is, he plainly will not be able to march king and pawn to the other side of the board in just eight moves. The board seems too empty to try to get black mated in the center. So that just leaves the white pawn marching down the board and promoting. Since that will require nearly all of white’s moves, black will both have to make sure that the white pawn has the captures it needs available to it, and also to make sure that his own king has no flight squares at the end.

Thinking along these lines might lead you to the idea of getting the white pawn to make a queen on c8, while black uses a promoted rook to block a7. And it turns out that’s doable! Here we go:

1. f1B Kg1 2.e1N Kh1:



3. Nf3 gxf3 4. d1R fxe4



5. Ra1 exd5 6. Ra7 d6



7. Ba6 d7 8. Bc8 dxc8Q mate



Pretty neat! This is one of those problems that feels more like a discovery than a composition. See you next week!



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Comments of the Week #93: from interstellar travel to an unknown monster [Starts With A Bang]

“Observing quasars is like observing the exhaust fumes of a car from a great distance and then trying to figure out what is going on under the hood.” -Carole Mundell

Have you been tunes in to Starts With A Bang during this past week? The first full week of January brings with it the annual American Astronomical Society’s giant meeting, and some of the most important discoveries and developments of the year! If you missed anything, here’s what we’ve covered:

I’ve also, in my time away at the meeting (again, something your support on Patreon helps enable) gotten a number of exclusive interviews and stories about discoveries and upcoming missions, and they’ll be revealed throughout the month on Starts With A Bang! My book, for those of you ordering from Amazon, will be in stock and shipping in just a couple of weeks (you can already download it on Kindle), and if you want it for your class, leave me a note and I can get you/your school/your students 30% discounted educator pricing! And now for the main event: your comments of the week!

Image credit: NASA / JPL.

Image credit: NASA / JPL.

From Denier on magnetism and the interstellar medium: “Sorry to rain on everyone’s parade, but the interstellar medium at high speed is nasty. Not only is there intense cosmic ray radiation, but a spacecraft striking random hydrogen atoms at anything over about 0.5c creates more radiation. The level of magnetic shielding needed in that environment would wreak havoc on our biology. It is not just the iron in our blood, but even the water that makes up more than 60% of our bodies is magnetic.”

Sure, a magnetic field of incredible magnitude for a long duration would be necessary at high-speeds in the interstellar medium to prevent collisions with ions; ionizing radiation at high speeds is dangerous and needs to be avoided. So the standard idea is to generate a magnetic field outside the spacecraft and then to shoot any neutral atoms with a laser to ionize them. But, Denier notes, something bad could happen to you, like — for instance — what happens to this frog at the National High Magnetic Field Laboratory in Tallahassee.

But just because you have a magnetic field outside of your spacecraft doesn’t mean you need to have one inside. One of the great properties of electromagnetism is that it has two types of charges: positive and negative, and so unlike with gravitation, it’s possible to shield yourself (with the right electromagnetic configuration) from both electric and magnetic fields.
Image credit: Mumetal®, via http://ift.tt/1OlykMJ.

Image credit: Mumetal®, via http://ift.tt/1OlykMJ.

As long as you create a more efficient path for the magnetic field lines to travel through the hull of your spacecraft (rather than through the inhabited interior) you won’t have any problems to the humans inside. I am well aware than not all of the problems associated with interstellar travel are easy to solve, but I’m pleased to inform you that this one is!

Image credit: NASA / Digital art by Les Bossinas (Cortez III Service Corp.), 1998.

Image credit: NASA / Digital art by Les Bossinas (Cortez III Service Corp.), 1998.

From Samuel J. Lawson on interstellar travel: “The section on warp drive doesn’t make mention of the proposed Albubierre (sic) drive, of which at last reading Harold White suggested the mass-energy requirement may be only about ~700kg, so long as the solution to the problem of ‘exotic matter’ and controlling the warp bubble from inside (among a great many other problems) are solvable. It may still be impossible (or very, very improbable) and likely requires a reconciliation between general relativity and quantum mechanics which heretofore has not been worked out. There are problems yet-to-be-solved, but at the very least it seems to me that there has been more accomplished in this field than the author suggests.”

If you are listening to what Harold White is suggesting with no evidence and doing anything other than dismissing it with no concern, you are going about this all wrong. (Harold White has said, and continues to say, a lot of garbage without a lot of evidence. If he were an engineer with any other job, no one would pay attention to it; because his job involves testing materials for NASA, he is taken as seriously as the organization of NASA itself. Cut that out.) Everything I mentioned about warp drive is true of the Alcubierre drive; the only difference is that the Alcubierre spacetime is the one known solution to Einstein’s relativity that creates the spacetime conditions necessary for warp drive. No, there has not been more accomplished in this field than I suggest. If you can find a relativist who thinks otherwise, I’ll happily do a 180.

Image credit: NASA, ESA, and G. Tremblay (European Southern Observatory).

Image credit: NASA, ESA, and G. Tremblay (European Southern Observatory).

From Eric on quantum computing: “My understanding is that the promise/power of quantum computing has to do with its ability to solve more mathematical problems, faster, than a traditional computer of equivalent power. Another is that entanglement can improve signal compression and encryption over long transmission lines. The fact that the computer will, when all computation in finished, eventually spit out a defined string of 0s and 1s, does not obviate these points. How a quantum computer can do more complex math faster, I’m not sure. Maybe someone else can answer that.”

I am unsure as to how we got onto the topic of quantum computing from a post on a galaxy cluster, but why not, right? Here’s the thing: a traditional computer encodes information into bits: 0 or 1. It has to store them, access them, and manipulate them, and for that, it requires a way to encode them. An abacus uses beads; a disk uses etchings; a solid-state drive (post-2009 flash drive) uses integrated circuit assemblies, etc. That’s traditional computing.

Image credit: D-Wave Systems, Inc., under c.c.-by-s.a.-3.0.

Image credit: D-Wave Systems, Inc., under c.c.-by-s.a.-3.0.

But quantum computing encodes information into qubits, which can use something like a spinning electron to have something encoded into 0, 1, or a superposition of 0-and-1; that special indeterminate state inherent to quantum computing. It’s a way to do probabilistic computing that provides an extra option (and hence, admits for often faster, superior algorithms) than traditional computing. Beyond that, it allows for the theoretical maximum in information storage/manipulation, where a single quantum particle is the “bit”. I hope this helps!

Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute, of Pluto and Charon, to scale and with comparatively accurate brightnesses.

Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute, of Pluto and Charon, to scale and with comparatively accurate brightnesses.

From MobiusKlein on Charon vs. Pluto: “If Charon has no atmosphere to speak of today, does that mean the theft is over? Thus Pluto is on a steady trend to loose it’s current stock of surface volitiles?”

It means that in the war-for-the-volatiles, Charon is definitely the big loser: it lost it all! It doesn’t necessarily mean that Pluto is the big winner though; it’s not like Pluto has all the volatiles now. Instead, there’s a good chance that Pluto had even more volatiles before it coalesced with Charon, but that in the aftermath of them becoming a bound binary, now the outer, higher atmospheric layers are gone.

Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute, of a backlit Pluto.

Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute, of a backlit Pluto.

Pluto’s rate-of-atmospheric loss was much lower than anticipated when we measured it, but the extent of its atmosphere told us it was more tightly bound to Pluto (at lower altitudes, for example) than our models had anticipated. It’s conceivable that without Charon, Pluto would have an even bigger, more diffuse atmosphere than it already does.

In order to find out, we’d need to find a large Kuiper Belt object and view it up close without a giant, near-orbiting moon. Next, please!

Image credit: simulations were performed at the National Center for Supercomputer Applications by Andrey Kravtsov (The University of Chicago) and Anatoly Klypin (New Mexico State University).

Image credit: simulations were performed at the National Center for Supercomputer Applications
by Andrey Kravtsov (The University of Chicago) and Anatoly Klypin (New Mexico State University).

From Chris Mannering on large-scale structure: ““•there would be a great cosmic web of structure, with small, medium and large-scale structures clumped together in certain patterns,”
Ethan this is completely untrue. The cosmic web and large scale structure was a complete surprise and shock when technological advances began knocking out data in the late 1980’s.”

This is exactly my area of expertise; this is what my Ph.D. was in, what my research is in, and what my educational sub-focus was in. Although, to be fair, there were only a handful of people working on it quantitatively up through the early 1980s. Fortunately, one of them happened to be my advisor (Jim Fry) and his advisor (Jim Peebles), who wrote the most influential book on the subject up until that point in 1980. Prior to 1980, the argument was where the power would be.

Images credit: James Schombert of the University of Oregon, via http://ift.tt/1pP9bTM.

Images credit: James Schombert of the University of Oregon, via http://ift.tt/1pP9bTM.

“Bottom-up” proponents like Peebles contended that small imperfections in the cosmic structure would form first, creating clusters, then dwarf galaxies, then large galaxies and finally clusters. “Top-down” proponents like Zel’dovich argues for a pancake/fragmentation model, that saw galaxies forming from larger clusters down to smaller scales. Either way would mean the tilt to the scalar spectral index (n_s) would be large, and so n_s would be far from 1. (Either much smaller or much larger.)

Image credit: NASA / WMAP science team.

Image credit: NASA / WMAP science team.

What inflation predicted is that the spectrum of initial fluctuations would be nearly scale-invariant, meaning we’d see a combination of top-down and bottom-up in our Universe for where the large-scale power is, and that n_s would be very close to 1. The current value of 0.968 tells us — from CMB measurements best of all — that this is correct. I don’t know how you think the history of cosmology is different, but I’d love to hear you dig yourself deeper if you’re willing.

Image credit: Brian Baskin on Twitter.

Image credit: Brian Baskin on Twitter.

From BlockThis on Forbes: “Go find out what Forbes is to its nature

No one is pleased about the security breach. Forbes is not unique to this advertising-served malware, but it’s up to them to do something about it. I have contacted them and am awaiting a response.

Image credit: NASA/DOE/Fermi LAT Collaboration.

Image credit: NASA/DOE/Fermi LAT Collaboration.

From Justin on Forbes: “I understand that websites make their money and pay their bills with advertising, and for sites that I trust I have no problem turning adblocker off and looking at their banner ads or what have you, however I do not want to expose my devices to known malware just to read an article (no matter how engrossing it may be).
Is there another site that hosts your full content or is it forbes exclusive now?”

Forbes pays me, so they get the exclusive rights for five full business days. After that, you can read it in full on Medium with no ads. (So, nothing to block.) You have to take the delay, though.

From D.C. Sessions on… surprise… Forbes: “I wanted to read it but Forbes refuses to serve the page, demanding that I turn off the adblocker that I don’t have.”

This is a new one! How weird. What are you running that you’re getting that? If it’s IBM-DOS and Lync… well, I just know there used to be a D.C. Sessions who commented on Starts With A Bang some 7 years ago, but not much since. How ya doin’, buddy?

Arp 274, a trio of star-forming galaxies. Image credit: NASA, ESA, M. Livio and the Hubble Heritage Team (STScI/AURA).

Arp 274, a trio of star-forming galaxies. Image credit: NASA, ESA, M. Livio and the Hubble Heritage Team (STScI/AURA).

And finally, for something cool, Michael Kelsey on antimatter galaxies: “@Ethan re Gary S’s question about antimatter galaxies: See http://ift.tt/1mmVRoV for a recent analysis of a slightly more complex “domain wall” analysis, where the authors consider a smooth (Gaussian) density interface between the hypothetical regions.
They first show that this model entirely escapes the best limits on “domain wall” type backgrounds (from COMPTEL, back in the day!). But what I liked is that they go further, and compute the apparent temperature effects from annihilation, and compare that with Planck data. They end up with a ~50 sigma discrepancy vs. data (chi^2 ~ 2400), which is a great exclusion.”

This is a neat paper. Previously, constraints like the one I talked about — domain walls, uniform structure and lack of gamma rays from annihilation — were the strongest constraints. But if one concocts a contrived model to evade those, one can still get an even stronger constraint by looking at the (now amazing) CMB!

Image credit: J. Baur, A. Blanchard and P. Von Ballmoos, 2015. http://ift.tt/1mmVRoV.

Image credit: J. Baur, A. Blanchard and P. Von Ballmoos, 2015. http://ift.tt/1mmVRoV.

You cannot make the Universe we see with equal amounts matter and antimatter, and that’s final!

Here’s looking forward to another great week, and looking forward to seeing you back here for more!



from ScienceBlogs http://ift.tt/1OlykMB

“Observing quasars is like observing the exhaust fumes of a car from a great distance and then trying to figure out what is going on under the hood.” -Carole Mundell

Have you been tunes in to Starts With A Bang during this past week? The first full week of January brings with it the annual American Astronomical Society’s giant meeting, and some of the most important discoveries and developments of the year! If you missed anything, here’s what we’ve covered:

I’ve also, in my time away at the meeting (again, something your support on Patreon helps enable) gotten a number of exclusive interviews and stories about discoveries and upcoming missions, and they’ll be revealed throughout the month on Starts With A Bang! My book, for those of you ordering from Amazon, will be in stock and shipping in just a couple of weeks (you can already download it on Kindle), and if you want it for your class, leave me a note and I can get you/your school/your students 30% discounted educator pricing! And now for the main event: your comments of the week!

Image credit: NASA / JPL.

Image credit: NASA / JPL.

From Denier on magnetism and the interstellar medium: “Sorry to rain on everyone’s parade, but the interstellar medium at high speed is nasty. Not only is there intense cosmic ray radiation, but a spacecraft striking random hydrogen atoms at anything over about 0.5c creates more radiation. The level of magnetic shielding needed in that environment would wreak havoc on our biology. It is not just the iron in our blood, but even the water that makes up more than 60% of our bodies is magnetic.”

Sure, a magnetic field of incredible magnitude for a long duration would be necessary at high-speeds in the interstellar medium to prevent collisions with ions; ionizing radiation at high speeds is dangerous and needs to be avoided. So the standard idea is to generate a magnetic field outside the spacecraft and then to shoot any neutral atoms with a laser to ionize them. But, Denier notes, something bad could happen to you, like — for instance — what happens to this frog at the National High Magnetic Field Laboratory in Tallahassee.

But just because you have a magnetic field outside of your spacecraft doesn’t mean you need to have one inside. One of the great properties of electromagnetism is that it has two types of charges: positive and negative, and so unlike with gravitation, it’s possible to shield yourself (with the right electromagnetic configuration) from both electric and magnetic fields.
Image credit: Mumetal®, via http://ift.tt/1OlykMJ.

Image credit: Mumetal®, via http://ift.tt/1OlykMJ.

As long as you create a more efficient path for the magnetic field lines to travel through the hull of your spacecraft (rather than through the inhabited interior) you won’t have any problems to the humans inside. I am well aware than not all of the problems associated with interstellar travel are easy to solve, but I’m pleased to inform you that this one is!

Image credit: NASA / Digital art by Les Bossinas (Cortez III Service Corp.), 1998.

Image credit: NASA / Digital art by Les Bossinas (Cortez III Service Corp.), 1998.

From Samuel J. Lawson on interstellar travel: “The section on warp drive doesn’t make mention of the proposed Albubierre (sic) drive, of which at last reading Harold White suggested the mass-energy requirement may be only about ~700kg, so long as the solution to the problem of ‘exotic matter’ and controlling the warp bubble from inside (among a great many other problems) are solvable. It may still be impossible (or very, very improbable) and likely requires a reconciliation between general relativity and quantum mechanics which heretofore has not been worked out. There are problems yet-to-be-solved, but at the very least it seems to me that there has been more accomplished in this field than the author suggests.”

If you are listening to what Harold White is suggesting with no evidence and doing anything other than dismissing it with no concern, you are going about this all wrong. (Harold White has said, and continues to say, a lot of garbage without a lot of evidence. If he were an engineer with any other job, no one would pay attention to it; because his job involves testing materials for NASA, he is taken as seriously as the organization of NASA itself. Cut that out.) Everything I mentioned about warp drive is true of the Alcubierre drive; the only difference is that the Alcubierre spacetime is the one known solution to Einstein’s relativity that creates the spacetime conditions necessary for warp drive. No, there has not been more accomplished in this field than I suggest. If you can find a relativist who thinks otherwise, I’ll happily do a 180.

Image credit: NASA, ESA, and G. Tremblay (European Southern Observatory).

Image credit: NASA, ESA, and G. Tremblay (European Southern Observatory).

From Eric on quantum computing: “My understanding is that the promise/power of quantum computing has to do with its ability to solve more mathematical problems, faster, than a traditional computer of equivalent power. Another is that entanglement can improve signal compression and encryption over long transmission lines. The fact that the computer will, when all computation in finished, eventually spit out a defined string of 0s and 1s, does not obviate these points. How a quantum computer can do more complex math faster, I’m not sure. Maybe someone else can answer that.”

I am unsure as to how we got onto the topic of quantum computing from a post on a galaxy cluster, but why not, right? Here’s the thing: a traditional computer encodes information into bits: 0 or 1. It has to store them, access them, and manipulate them, and for that, it requires a way to encode them. An abacus uses beads; a disk uses etchings; a solid-state drive (post-2009 flash drive) uses integrated circuit assemblies, etc. That’s traditional computing.

Image credit: D-Wave Systems, Inc., under c.c.-by-s.a.-3.0.

Image credit: D-Wave Systems, Inc., under c.c.-by-s.a.-3.0.

But quantum computing encodes information into qubits, which can use something like a spinning electron to have something encoded into 0, 1, or a superposition of 0-and-1; that special indeterminate state inherent to quantum computing. It’s a way to do probabilistic computing that provides an extra option (and hence, admits for often faster, superior algorithms) than traditional computing. Beyond that, it allows for the theoretical maximum in information storage/manipulation, where a single quantum particle is the “bit”. I hope this helps!

Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute, of Pluto and Charon, to scale and with comparatively accurate brightnesses.

Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute, of Pluto and Charon, to scale and with comparatively accurate brightnesses.

From MobiusKlein on Charon vs. Pluto: “If Charon has no atmosphere to speak of today, does that mean the theft is over? Thus Pluto is on a steady trend to loose it’s current stock of surface volitiles?”

It means that in the war-for-the-volatiles, Charon is definitely the big loser: it lost it all! It doesn’t necessarily mean that Pluto is the big winner though; it’s not like Pluto has all the volatiles now. Instead, there’s a good chance that Pluto had even more volatiles before it coalesced with Charon, but that in the aftermath of them becoming a bound binary, now the outer, higher atmospheric layers are gone.

Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute, of a backlit Pluto.

Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute, of a backlit Pluto.

Pluto’s rate-of-atmospheric loss was much lower than anticipated when we measured it, but the extent of its atmosphere told us it was more tightly bound to Pluto (at lower altitudes, for example) than our models had anticipated. It’s conceivable that without Charon, Pluto would have an even bigger, more diffuse atmosphere than it already does.

In order to find out, we’d need to find a large Kuiper Belt object and view it up close without a giant, near-orbiting moon. Next, please!

Image credit: simulations were performed at the National Center for Supercomputer Applications by Andrey Kravtsov (The University of Chicago) and Anatoly Klypin (New Mexico State University).

Image credit: simulations were performed at the National Center for Supercomputer Applications
by Andrey Kravtsov (The University of Chicago) and Anatoly Klypin (New Mexico State University).

From Chris Mannering on large-scale structure: ““•there would be a great cosmic web of structure, with small, medium and large-scale structures clumped together in certain patterns,”
Ethan this is completely untrue. The cosmic web and large scale structure was a complete surprise and shock when technological advances began knocking out data in the late 1980’s.”

This is exactly my area of expertise; this is what my Ph.D. was in, what my research is in, and what my educational sub-focus was in. Although, to be fair, there were only a handful of people working on it quantitatively up through the early 1980s. Fortunately, one of them happened to be my advisor (Jim Fry) and his advisor (Jim Peebles), who wrote the most influential book on the subject up until that point in 1980. Prior to 1980, the argument was where the power would be.

Images credit: James Schombert of the University of Oregon, via http://ift.tt/1pP9bTM.

Images credit: James Schombert of the University of Oregon, via http://ift.tt/1pP9bTM.

“Bottom-up” proponents like Peebles contended that small imperfections in the cosmic structure would form first, creating clusters, then dwarf galaxies, then large galaxies and finally clusters. “Top-down” proponents like Zel’dovich argues for a pancake/fragmentation model, that saw galaxies forming from larger clusters down to smaller scales. Either way would mean the tilt to the scalar spectral index (n_s) would be large, and so n_s would be far from 1. (Either much smaller or much larger.)

Image credit: NASA / WMAP science team.

Image credit: NASA / WMAP science team.

What inflation predicted is that the spectrum of initial fluctuations would be nearly scale-invariant, meaning we’d see a combination of top-down and bottom-up in our Universe for where the large-scale power is, and that n_s would be very close to 1. The current value of 0.968 tells us — from CMB measurements best of all — that this is correct. I don’t know how you think the history of cosmology is different, but I’d love to hear you dig yourself deeper if you’re willing.

Image credit: Brian Baskin on Twitter.

Image credit: Brian Baskin on Twitter.

From BlockThis on Forbes: “Go find out what Forbes is to its nature

No one is pleased about the security breach. Forbes is not unique to this advertising-served malware, but it’s up to them to do something about it. I have contacted them and am awaiting a response.

Image credit: NASA/DOE/Fermi LAT Collaboration.

Image credit: NASA/DOE/Fermi LAT Collaboration.

From Justin on Forbes: “I understand that websites make their money and pay their bills with advertising, and for sites that I trust I have no problem turning adblocker off and looking at their banner ads or what have you, however I do not want to expose my devices to known malware just to read an article (no matter how engrossing it may be).
Is there another site that hosts your full content or is it forbes exclusive now?”

Forbes pays me, so they get the exclusive rights for five full business days. After that, you can read it in full on Medium with no ads. (So, nothing to block.) You have to take the delay, though.

From D.C. Sessions on… surprise… Forbes: “I wanted to read it but Forbes refuses to serve the page, demanding that I turn off the adblocker that I don’t have.”

This is a new one! How weird. What are you running that you’re getting that? If it’s IBM-DOS and Lync… well, I just know there used to be a D.C. Sessions who commented on Starts With A Bang some 7 years ago, but not much since. How ya doin’, buddy?

Arp 274, a trio of star-forming galaxies. Image credit: NASA, ESA, M. Livio and the Hubble Heritage Team (STScI/AURA).

Arp 274, a trio of star-forming galaxies. Image credit: NASA, ESA, M. Livio and the Hubble Heritage Team (STScI/AURA).

And finally, for something cool, Michael Kelsey on antimatter galaxies: “@Ethan re Gary S’s question about antimatter galaxies: See http://ift.tt/1mmVRoV for a recent analysis of a slightly more complex “domain wall” analysis, where the authors consider a smooth (Gaussian) density interface between the hypothetical regions.
They first show that this model entirely escapes the best limits on “domain wall” type backgrounds (from COMPTEL, back in the day!). But what I liked is that they go further, and compute the apparent temperature effects from annihilation, and compare that with Planck data. They end up with a ~50 sigma discrepancy vs. data (chi^2 ~ 2400), which is a great exclusion.”

This is a neat paper. Previously, constraints like the one I talked about — domain walls, uniform structure and lack of gamma rays from annihilation — were the strongest constraints. But if one concocts a contrived model to evade those, one can still get an even stronger constraint by looking at the (now amazing) CMB!

Image credit: J. Baur, A. Blanchard and P. Von Ballmoos, 2015. http://ift.tt/1mmVRoV.

Image credit: J. Baur, A. Blanchard and P. Von Ballmoos, 2015. http://ift.tt/1mmVRoV.

You cannot make the Universe we see with equal amounts matter and antimatter, and that’s final!

Here’s looking forward to another great week, and looking forward to seeing you back here for more!



from ScienceBlogs http://ift.tt/1OlykMB

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