Jan. 12th, 2013

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Monster Quasar Discovered with Power Outflow 100 Times Milky Way Galaxy

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Researchers have discovered a quasar known as SDSS J1106+1939 with the most energetic outflow ever, a finding that may answer questions about how the mass of a galaxy is linked to its central black hole mass and why there are so few large galaxies in the universe. The rate that energy is carried away by the huge mass of material ejected is equivalent to two trillion times the power output of the sun. The black hole at the heart of quasar SDSS J1106-1939 is massive, estimated to be a thousand times heavier than the black hole in the Milky Way.
"This is about 100 times higher than the total power output of the Milky Way galaxy — it's a real monster outflow," said Nahum Arav, an associate professor of physics in College of Science at Virginia Tech and leader of the research team, which includes Benoit Borguet, now a postdoctoral researcher now at the University of Liege, Belgium; Doug Edmonds and Carter Chamberlain, both graduate research assistants at Virginia Tech, and Chris Benn, a collaborator who works with the Isaac Newton Group of Telescopes in Spain.


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#quasar #physics #astrophysics #astronomy
@The Final Frontier
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Image/photo

A new paper by scientists on NASA's Cassini mission finds that blocks of hydrocarbon ice might decorate the surface of existing lakes and seas of liquid hydrocarbon on Saturn's moon Titan. The presence of ice floes might explain some of the mixed readings Cassini has seen in the reflectivity of the surfaces of lakes on Titan.
"One of the most intriguing questions about these lakes and seas is whether they might host an exotic form of life," said Jonathan Lunine, a paper co-author and Cassini interdisciplinary Titan scientist at Cornell University, Ithaca, N.Y. "And the formation of floating hydrocarbon ice will provide an opportunity for interesting chemistry along the boundary between liquid and solid, a boundary that may have been important in the origin of terrestrial life."

Titan is the only other body besides Earth in our solar system with stable bodies of liquid on its surface. But while our planet's cycle of precipitation and evaporation involves water, Titan's cycle involves hydrocarbons like ethane and methane. Ethane and methane are organic molecules, which scientists think can be building blocks for the more complex chemistry from which life arose. Cassini has seen a vast network of these hydrocarbon seas cover Titan's northern hemisphere, while a more sporadic set of lakes bejewels the southern hemisphere.

Scientists think the variations in reflectivity, or brightness, have to do with the smoothness or texture of the surface. If a lake is fully liquid, it looks dark, but if it is only partially liquid, it looks brighter.

Up to this point, Cassini scientists assumed that Titan lakes would not have floating ice, because solid methane is denser than liquid methane and would sink. But the new model considers the interaction between the lakes and the atmosphere, resulting in different mixtures of compositions, pockets of nitrogen gas, and changes in temperature. The result, scientists found, is that winter ice will float in Titan's methane-and-ethane-rich lakes and seas if the temperature is below the freezing point of methane—minus 297 degrees Fahrenheit (90.4 kelvins).

The scientists realized all the varieties of ice they considered would float if they were composed of at least 5 percent "air," which is an average composition for young sea ice on Earth. ("Air" on Titan has significantly more nitrogen than Earth air and almost no oxygen.)

If the temperature drops by just a few degrees, the ice will sink because of the relative proportions of nitrogen gas in the liquid versus the solid. Temperatures close to the freezing point of methane could lead to both floating and sinking ice - that is, a hydrocarbon ice crust above the liquid and blocks of hydrocarbon ice on the bottom of the lake bed. Scientists haven't entirely figured out what color the ice would be, though they suspect it would be colorless, as it is on Earth, perhaps tinted reddish-brown from Titan's atmosphere.

"We now know it's possible to get methane-and-ethane-rich ice freezing over on Titan in thin blocks that congeal together as it gets colder—similar to what we see with Arctic sea ice at the onset of winter," said Jason Hofgartner, first author on the paper and a Natural Sciences and Engineering Research Council of Canada scholar at Cornell. "We'll want to take these conditions into consideration if we ever decide to explore the Titan surface some day."

Cassini's radar instrument will be able to test this model by watching what happens to the reflectivity of the surface of these lakes and seas. A hydrocarbon lake warming in the early spring thaw, as the northern lakes of Titan have begun to do, may become more reflective as ice rises to the surface. This would provide a rougher surface quality that reflects more radio energy back to Cassini, making it look brighter. As the weather turns warmer and the ice melts, the lake surface will be pure liquid, and will appear to the Cassini radar to darken.

"Cassini's extended stay in the Saturn system gives us an unprecedented opportunity to watch the effects of seasonal change at Titan," said Linda Spilker, Cassini project scientist at NASA's Jet Propulsion Laboratory, Pasadena, Calif. "We'll have an opportunity to see if the theories are right."


The Daily Galaxy via JPL/NASA

#saturn #titan #extraterrestrial #life
@The Final Frontier
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Charles Roth wrote the following post:

Glenn Greenwald
The inspiring heroism of Aaron Swartz | Glenn Greenwald


The internet freedom activist committed suicide on Friday at age 26, but his life was driven by courage and passion

Aaron Swartz, the computer programmer and internet freedom activist, committed suicide on Friday in New York at the age of 26. As the incredibly moving remembrances from his friends such as Cory Doctorow and Larry Lessig attest, he was unquestionably brilliant but also - like most everyone - a complex human being plagued by demons and flaws. For many reasons, I don't believe in whitewashing someone's life or beatifying them upon death. But, to me, much of Swartz's tragically short life was filled with acts that are genuinely and, in the most literal and noble sense, heroic. I think that's really worth thinking about today.

At the age of 14, Swartz played a key role in developing the RSS software that is still widely used to enable people to manage what they read on the internet. As a teenager, he also played a vital role in the creation of Reddit, the wildly popular social networking news site. When Conde Nast purchased Reddit, Swartz received a substantial sum of money at a very young age. He became something of a legend in the internet and programming world before he was 18. His path to internet mogul status and the great riches it entails was clear, easy and virtually guaranteed: a path which so many other young internet entrepreneurs have found irresistible, monomaniacally devoting themselves to making more and more money long after they have more than they could ever hope to spend.

But rather obviously, Swartz had little interest in devoting his life to his own material enrichment, despite how easy it would have been for him. As Lessig wrote: "Aaron had literally done nothing in his life 'to make money' . . . Aaron was always and only working for (at least his conception of) the public good."

Specifically, he committed himself to the causes in which he so passionately believed: internet freedom, civil liberties, making information and knowledge as available as possible. Here he is in his May, 2012 keynote address at the Freedom To Connect conference discussing the role he played in stopping SOPA, the movie-industry-demanded legislation that would have vested the government with dangerous censorship powers over the internet.

Critically, Swartz didn't commit himself to these causes merely by talking about them or advocating for them. He repeatedly sacrificed his own interests, even his liberty, in order to defend these values and challenge and subvert the most powerful factions that were their enemies. That's what makes him, in my view, so consummately heroic.

In 2008, Swartz targeted Pacer, the online service that provides access to court documents for a per-page fee. What offended Swartz and others was that people were forced to pay for access to public court documents that were created at public expense. Along with a friend, Swartz created a program to download millions of those documents and then, as Doctorow wrote, "spent a small fortune fetching a titanic amount of data and putting it into the public domain." For that act of civil disobedience, he was investigated and harassed by the FBI, but never charged.

But in July 2011, Swartz was arrested for allegedly targeting JSTOR, the online publishing company that digitizes and distributes scholarly articles written by academics and then sells them, often at a high price, to subscribers. As Maria Bustillos detailed, none of the money goes to the actual writers (usually professors) who wrote the scholarly articles - they are usually not paid for writing them - but instead goes to the publishers.

This system offended Swartz (and many other free-data activists) for two reasons: it charged large fees for access to these articles but did not compensate the authors, and worse, it ensured that huge numbers of people are denied access to the scholarship produced by America's colleges and universities. The indictment filed against Swartz alleged that he used his access as a Harvard fellow to the JSTOR system to download millions of articles with the intent to distribute them online for free; when he was detected and his access was cut off, the indictment claims he then trespassed into an MIT computer-wiring closet in order to physically download the data directly onto his laptop.

Swartz never distributed any of these downloaded articles. He never intended to profit even a single penny from anything he did, and never did profit in any way. He had every right to download the articles as an authorized JSTOR user; at worst, he intended to violate the company's "terms of service" by making the articles available to the public. Once arrested, he returned all copies of everything he downloaded and vowed not to use them. JSTOR told federal prosecutors that it had no intent to see him prosecuted, though MIT remained ambiguous about its wishes.

But federal prosecutors ignored the wishes of the alleged "victims". Led by a federal prosecutor in Boston notorious for her overzealous prosecutions, the DOJ threw the book at him, charging Swartz with multiple felonies which carried a total sentence of several decades in prison and $1 million in fines.

Swartz's trial on these criminal charges was scheduled to begin in two months. He adamantly refused to plead guilty to a felony because he did not want to spend the rest of his life as a convicted felon with all the stigma and rights-denials that entails. The criminal proceedings, as Lessig put it, already put him in a predicament where "his wealth [was]bled dry, yet unable to appeal openly to us for the financial help he needed to fund his defense, at least without risking the ire of a district court judge."

To say that the DOJ's treatment of Swartz was excessive and vindictive is an extreme understatement. When I wrote about Swartz's plight last August, I wrote that he was "being prosecuted by the DOJ with obscene over-zealousness". Timothy Lee wrote the definitive article in 2011 explaining why, even if all the allegations in the indictment are true, the only real crime committed by Swartz was basic trespassing, for which people are punished, at most, with 30 days in jail and a $100 fine, about which Lee wrote: "That seems about right: if he's going to serve prison time, it should be measured in days rather than years."

Nobody knows for sure why federal prosecutors decided to pursue Swartz so vindictively, as though he had committed some sort of major crime that deserved many years in prison and financial ruin. Some theorized that the DOJ hated him for his serial activism and civil disobedience. Others speculated that, as Doctorow put it, "the feds were chasing down all the Cambridge hackers who had any connection to Bradley Manning in the hopes of turning one of them."

I believe it has more to do with what I told the New York Times' Noam Cohen for an article he wrote on Swartz's case. Swartz's activism, I argued, was waged as part of one of the most vigorously contested battles - namely, the war over how the internet is used and who controls the information that flows on it - and that was his real crime in the eyes of the US government: challenging its authority and those of corporate factions to maintain a stranglehold on that information. In that above-referenced speech on SOPA, Swartz discussed the grave dangers to internet freedom and free expression and assembly posed by the government's efforts to control the internet with expansive interpretations of copyright law and other weapons to limit access to information.

That's a major part of why I consider him heroic. He wasn't merely sacrificing himself for a cause. It was a cause of supreme importance to people and movements around the world - internet freedom - and he did it by knowingly confronting the most powerful state and corporate factions because he concluded that was the only way to achieve these ends.

Suicide is an incredibly complicated phenomenon. I didn't know Swartz nearly well enough even to form an opinion about what drove him to do this; I had a handful of exchanges with him online in which we said nice things about each other's work and I truly admired him. I'm sure even his closest friends and family are struggling to understand exactly what caused him to defy his will to live by taking his own life.

But, despite his public and very sad writings about battling depression, it only stands to reason that a looming criminal trial that could send him to prison for decades played some role in this; even if it didn't, this persecution by the DOJ is an outrage and an offense against all things decent, for the reasons Lessig wrote today:

"Here is where we need a better sense of justice, and shame. For the outrageousness in this story is not just Aaron. It is also the absurdity of the prosecutor's behavior. From the beginning, the government worked as hard as it could to characterize what Aaron did in the most extreme and absurd way. The 'property' Aaron had 'stolen', we were told, was worth 'millions of dollars' — with the hint, and then the suggestion, that his aim must have been to profit from his crime. But anyone who says that there is money to be made in a stash of ACADEMIC ARTICLES is either an idiot or a liar. It was clear what this was not, yet our government continued to push as if it had caught the 9/11 terrorists red-handed.

"A kid genius. A soul, a conscience, the source of a question I have asked myself a million times: What would Aaron think? That person is gone today, driven to the edge by what a decent society would only call bullying. I get wrong. But I also get proportionality. And if you don't get both, you don't deserve to have the power of the United States government behind you.

"For remember, we live in a world where the architects of the financial crisis regularly dine at the White House — and where even those brought to 'justice' never even have to admit any wrongdoing, let alone be labeled 'felons'."


Whatever else is true, Swartz was destroyed by a "justice" system that fully protects the most egregious criminals as long as they are members of or useful to the nation's most powerful factions, but punishes with incomparable mercilessness and harshness those who lack power and, most of all, those who challenge power.

Swartz knew all of this. But he forged ahead anyway. He could have easily opted for a life of great personal wealth, status, prestige and comfort. He chose instead to fight - selflessly, with conviction and purpose, and at great risk to himself - for noble causes to which he was passionately devoted. That, to me, isn't an example of heroism; it's the embodiment of it, its purest expression. It's the attribute our country has been most lacking.

I always found it genuinely inspiring to watch Swartz exude this courage and commitment at such a young age. His death had better prompt some serious examination of the DOJ's behavior - both in his case and its warped administration of justice generally. But his death will also hopefully strengthen the inspirational effects of thinking about and understanding the extraordinary acts he undertook in his short life.

Glenn Greenwald


#Aaron Swartz #freeom of information #internet #freedom #information

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