Astrophile: A scorched world with snow black and smoky

Astrophile is our weekly column on curious cosmic objects, from the solar system to the far reaches of the multiverse

Object: Titanium oxide snow
Location: The hot-Jupiter planet HD 209458b

There is something magical about waking up to discover it has snowed during the night. But there's no powdery white blanket when it snows on exoplanet HD 209458b. Snow there is black, smoky and hot as hell – resembling a forest fire more than a winter wonderland. Put it this way: you won't be needing mittens.

HD 209458b belongs to a family called hot Jupiters, gas-giant planets that are constantly being roasted due to their closeness to their sun. By contrast, the gas giants in our immediate neighbourhood, including Jupiter, are frigid, lying at the solar system's far reaches.

HD 209458b is also noteworthy because it is tidally locked, so one side is permanently facing towards its star while the other is in perpetual night. On the face of it, these conditions wouldn't seem to invite snow: temperatures on the day side come close to 2000° C, while the night side is comparatively chilly at around 500° C.

Snow made of water is, of course, impossible on this scorched world, but the drastic temperature differential sets up atmospheric currents that swirl material from the day side to night and vice versa. That means that any substances with the right combination of properties might be gaseous on the day side and then condense into a solid on the night side, and fall as precipitation. Say hello to titanium oxide snow.

Stuck on the surface

Although oxides of titanium make up only a small component of a hot Jupiter's atmosphere, these compounds have the right properties to fall as snow. But there was a snag that could have put a stop to any blizzards. Older computer models of hot Jupiters suggested that titanium oxides condensing in the air on the night side would snow – and remain on the relatively cool surface forever. "Imagine on Earth if you had no mechanism to evaporate water, it would never rain," says Vivien Parmentier of the Côte d'Azur Observatory in Nice, France.

Now he and colleagues have created a more detailed 3D computer model that shows that the snow can become a gas again as it falls and the temperature and pressure increase. Strong updraughts can then blow the titanium oxides back to the upper atmosphere. "The gas can come back on the top layers and snow again and again," says Parmentier.

Snowfall on HD 209458b would be like none you've ever seen. Though titanium dioxide is white and shiny, for example, the snowflakes would also contain silica oxides from the atmosphere, making them black. Since the atmosphere is also dark, snowstorms on the planet would be a smoky affair, the opposite of the white-outs we get on Earth. "It would be like being in the middle of a forest fire," says Parmentier.

Although the team studied a particular hot Jupiter, their model should apply equally to other planets of this type, suggesting hot snow is a common occurrence. Parmentier says we may have already spotted snow clouds on another hot Jupiter, HD 189733b, as spectral analysis of the planet suggests the presence of microscopic particles in its atmosphere.

David Sing of the University of Exeter, UK, who helped identify such particles on HD 189733b, says the team's new model goes a long way to explaining how titanium oxides behave on hot Jupiters. "We're pretty used to water condensing on Earth; there it is titanium because the temperatures are so much hotter."

Hot, black snow – now that would be something to wake up to.

Reference: http://arxiv.org/abs/1301.4522

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Twitter hit by "sophisticated" cyber attack

SAN FRANCISCO: Twitter said Friday it had been hit by a "sophisticated" cyber attack similar to those that recently hit major Western news outlets, and that the passwords of about 250,000 users were stolen.

"This attack was not the work of amateurs, and we do not believe it was an isolated incident," Twitter information security director Bob Lord said in a blog post.

Lord referred to an "uptick in large-scale security attacks aimed at US technology and media companies" as he told of Twitter detecting attempts this week to get unauthorized access to data in the firm's network.

The attack coincided with the revelation of several high-profile security breaches. The New York Times and The Wall Street Journal said this week that they had been hacked, and pointed to hackers from China.

Twitter did not confirm the source of the intrusion.

But Lord noted that "the attackers were extremely sophisticated, and we believe other companies and organizations have also been recently similarly attacked."

He said that Twitter shut down a live attack as it was in process.

However, Lord added, cyber attackers may have gotten usernames, email addresses, passwords and other data.

As a precaution, Twitter invalidated passwords of accounts at issue and sent people email messages telling them to create new passwords.

-AFP/ac

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Crave Ep. 107: Madden NFL 13 predicts Super Bowl XLVII

Madden NFL 13 predicts Super Bowl XLVII, Ep. 107

Subscribe to Crave:

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Sorry, San Francisco. An annual Madden NFL Super Bowl simulation predicts the Ravens will trump the 49ers in the final seconds of Sunday's Big Game. Get on this, Vegas! And with "Star Wars" in the news, Crave asks if J.J. Abrams can pull off the impossible directing both "Star Wars Episode VII" and "Star Trek." Are you into it or not into it? Maybe a J.J. Abrams and "Star Wars"-themed musical will help you decide.

Crave stories:

- Student builds R2-D2 powered by Raspberry Pi

- Orbiting robot gas station gets closer to reality

- Creepy realistic vampire baby dolls are immortal

- Artists use real-time MRI footage to create music video

- Madden attempts to predict Super Bowl XLVII victor

- Forget Episode VII, watch 'JJ Abrams Star Wars -- The Musical'

- Crave giveaway: $200 shopping spree at KlearGear.com

Social networking:

- Stephen on Twitter

- Stephen on Google+

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Pictures We Love: Best of January

Photograph by Dieu Nalio Chery, AP

The magnitude 7 earthquake that struck near Port au Prince, Haiti, in January 2010 so devastated the country that recovery efforts are still ongoing.

Professional dancer Georges Exantus, one of the many casualties of that day, was trapped in his flattened apartment for three days, according to news reports. After friends dug him out, doctors amputated his right leg below the knee. With the help of a prosthetic leg, Exantus is able to dance again. (Read about his comeback.)

Why We Love It

"This is an intimate photo, taken in the subject's most personal space as he lies asleep and vulnerable, perhaps unaware of the photographer. The dancer's prosthetic leg lies in the foreground as an unavoidable reminder of the hardships he faced in the 2010 earthquake. This image makes me want to hear more of Georges' story."—Ben Fitch, associate photo editor

"This image uses aesthetics and the beauty of suggestion to tell a story. We are not given all the details in the image, but it is enough to make us question and wonder."—Janna Dotschkal, associate photo editor

Published February 1, 2013

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Hillary Clinton Says Goodbye...Until 2016?

Feb 1, 2013 6:48pm

Image Credit: Manuel Balce Ceneta/AP Photo

After four years, nearly a million miles traveled and 112 countries visited, Hillary Clinton stepped down as the 67th secretary of state on Friday. But even on this, her final day as America’s top diplomat, she could not escape the questions about what she’ll do four years from now.

Many of the 1,000 employees who gathered to see her off expressed hope that this was not the end of her political career.

“2016! 2016!” the crowd chanted as   Clinton waved and drove away. “We’ll Miss You!”

Right before her departure, Clinton gave the traditional farewell speech to staff on the steps of the State Department’s historic C street lobby. In a roughly 10 minute, often reflective speech she called the 70,000 State Department employees part of “a huge extended family.”

“I cannot fully express how grateful I am to those with whom I have spent many hours here in Washington, around the world and in airplanes,” she said, drawing laughter from the audience.

Clinton’s trademark sense of humor was on display, even as she grew emotional  speaking about how much the State Department had  meant to her over the last four years.

PHOTOS: Hillary Clinton Through the Years

“I am very proud to have been secretary of state. I will miss you. I will probably be dialing ops just to talk,” she joked to a cheering and laughing crowd. “I will wonder what you all are doing, because I know that because of your efforts day after day, we are making a real difference.”

But  Clinton also was somber when discussing the danger diplomats and foreign service officers face all over the world, using Thursday’s suicide bombing attack against the U.S. Embassy in Ankara, Turkey, in which a Turkish guard was killed, as an example.

“We live in very complex and even dangerous times, as we saw again just today at our embassy in Ankara, where we were attacked and lost one of our foreign service nationals, and others injured,” said Clinton “But I spoke with the ambassador and the team there. I spoke with my Turkish counterpart. And I told them how much we valued their commitment and their sacrifice.”

Clinton was flanked by trusted deputies, Bill Burns and Tom Nides, whom she gave warm hugs to at the end of the speech. With a huge “Thank You” sign behind her she walked a rope line after finishing her speech, greeting the hordes of employees who wanted to shake her hand and say goodbye before she walked out of the State Department as secretary of state for the last time.

“It’s been quite a challenging week saying goodbye to so many people and knowing that I will not have the opportunity to continue being part of this amazing team,” Clinton said. “But I am so grateful that we’ve had a chance to contribute in each of our ways to making our country and our world stronger, safer, fairer and better.”

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Swarm-mongering: Brainless blobs flock together

Birds of a feather flock together and now so do brainless, inanimate blobs. Made of microscopic particles, the artificial swarms could shed light on the mysterious mechanisms behind the natural swarming seen in fish and birds. They might also lead to materials with novel properties like self-healing.

Animals such as birds, fish and even humans that move together in swarms have individual intelligence, but Jérémie Palacci of New York University and colleagues wondered whether inanimate objects could also swarm. "From a physicist's point of view, if many different systems behave in the same way there must be an underlying physical rule," he says.

To explore this idea, the team created microscopic plastic spheres, each one with a cubic patch of haematite, an iron oxide, on its surface. When submerged in hydrogen peroxide, the spheres spread out in a disordered fashion. The team then shone blue light on the particles, causing the haematite cubes to catalyse the breakdown of any nearby hydrogen peroxide into water and oxygen. As hydrogen peroxide concentration dropped temporarily in these regions due to the reaction, osmotic forces cause more hydrogen peroxide to flow into them, and that in turn buffets the spheres. The whole process then repeats.

Self-healing swarm

When two spheres come close enough to each other, the balance of chemical forces shifts so that the two spheres are attracted. If there are enough spheres in the same place they will cluster together to form shapes of symmetrically arranged particles, which the team call crystals (see video, above). These crystals continue to be buffeted by the movement caused by the breakdown of hydrogen peroxide – but now they move together as one object, replicating a life-like swarm. Switch off the light, however, and the reaction stops, causing the crystal to lose the forces that hold it together, and the particle distribution becomes disordered once again.

"This system shows that even though the particles have no social interaction or intelligence, you can exhibit collective behaviour with no biology involved," says Palacci. Since the haematite is magnetic, it is even possible to steer the crystals in one direction by applying a magnetic field. Such control might be useful if the artificial swarms are to be harnessed for applications.

As the particles automatically fill any gaps that form in the crystal, again thanks to the chemical dynamics of the system, they could be used to create a self-assembling, self-healing material. The work is published in the journal Science today.

Schooled by fish

Iain Couzin of Princeton University says these kinds of systems are very useful for studying biological collective behaviour because researchers have complete control over their interactions – unlike natural systems.

His team has its own swarming experiment published in the same issue of Science, based on schools of fish that prefer to stay in shade. Their paper shows that shining a light on some of the fish in the school causes them to speed up, to get away from the light. But as a result, non-illuminated fish also speed up, even though, if acting purely as individuals, they would have had no reason to do so. "We show just by using simple interactions that schools can have a sense of responsiveness to the environment that individuals do not have," he says.

Couzin sees no reason why such behaviour should be limited to natural systems. "In future it may be possible to create systems of particles that can make collective decisions – something we often think of as only possible in biological systems," he says.

Journal references: Living crystals: Science, DOI: 10.1126/science.1230020; Fish: Science, DOI: 10.1126/science.1225883

If you would like to reuse any content from New Scientist, either in print or online, please contact the syndication department first for permission. New Scientist does not own rights to photos, but there are a variety of licensing options available for use of articles and graphics we own the copyright to.

All comments should respect the New Scientist House Rules. If you think a particular comment breaks these rules then please use the "Report" link in that comment to report it to us.

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Sony invites press to mystery New York event

SAN FRANCISCO: Sony sent out invitations Thursday to a mystery event in New York City on February 20, sparking rumors that the world would get its first look at a new-generation PlayStation videogame console.

Both Sony and Microsoft are expected this year to show off successors to their competing consoles, which have been evolving into home entertainment hubs for films, television, music, social networking and more.

The PlayStation 3 was released in November 2006 and industry trackers believe a successor is on the near horizon.

In January, the number of PS3 units shipped by Sony hit an estimated 77 million units, according to market research firm International Data Corporation.

IDC gaming research manager Lewis Ward predicted at the time of the report that consoles will retain their strongholds in homes while expanding to include other digital entertainment.

"The console ecosystem is in a state of flux since these platforms need to support an ever-growing array of non-gaming features and services at the same time that game distribution and monetization is moving in a digital direction," Ward said.

"It doesn't appear that alternative platforms -- set-top boxes from cable companies, Web-connected smart TVs and so on -- are positioned to materially disrupt the trajectory of the 'big 3' console OEMs in 2013 or 2014."

Videogame industry sales should be bolstered by the arrival of next-generation videogame consoles from Sony and Microsoft, according to Ward.

"With the advent of eighth-generation consoles, starting with the Wii U, historical norms strongly imply that game disk revenue will stop bleeding in 2013 and rise substantively in 2014," he said in the report.

- AFP/ir

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Google reportedly gives EU antitrust probe settlement offer

Google was expected to submit a settlement proposal for the European Commission's antitrust inquiry by the end of January. And, it looks like the Web giant just made the deadline.

According to AllThingsD, sources familiar with the matter said that Google turned in a detailed proposal earlier today. However neither Google nor the EC are confirming whether a settlement proposal was definitively submitted.

When asked about the settlement offer, a Google spokesperson told CNET, "We continue to work cooperatively with the European Commission." The EC's press office has not yet responded to CNET's request for comment.

The EU's antitrust probe was opened in 2010 when European regulators asked the company to explain how it ranked search results and advertising after complaints of anticompetitive behavior from European businesses. Throughout the course of the inquiry, Google has been trying to settle. Google faces a fine of up to 10 percent of its global revenue, or about $4 billion, if the commission finds it has violated European antitrust laws.

This case mirrors a similar probe in the U.S. that was brought by the Federal Trade Commission and settled earlier this month. Under the FTC's settlement, a handful of companies may now choose to stop showing their results inside Google products like Google+ Local, Google Shopping, and Hotels. The search giant also agreed to voluntarily change the way it uses other Web sites' data.

Despite the EC and Google not being forthcoming about whether a settlement proposal was submitted today, inside sources did tell AllThingsD that the purported agreement looks very similar to the FTC's settlement. The main differences are that supposedly the EC agreement addresses better product labeling in search results but does not discuss patents.

Throughout both the U.S. and European Union probes, Google has denied any wrongdoing. In its agreement with the FTC, the company maintained its stance that it has done nothing wrong. According to AllThingsD, the EC settlement proposal will likely contain similar language.

Even if Google did submit a proposal today, it's still unclear whether the EC will accept it.

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Sinkhole Swallows Buildings in China

Photograph from AFP/Getty Images

The sinkhole that formed in the southern Chinese city of Guangzhou (pictured) is, unfortunately, not a new occurrence for the country.

Many areas of the world are susceptible to these sudden formations, including the U.S. Florida is especially prone, but Guatemala, Mexico, and the area surrounding the Dead Sea in the Middle East are also known for their impressive sinkholes. (See pictures of a sinkhole in Beijing that swallowed a truck.)

Published January 31, 2013

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What If Undocumented Immigrants Had Voted?

If every undocumented immigrant had cast a vote for President Obama in 2012, he would have won Arizona, Georgia, North Carolina and Texas, and he would have beaten Mitt Romney by nearly 11 percentage points nationally, instead of three.

Only citizens can vote, however, and 11.2 million unauthorized residents didn't get the chance.

But with immigration overhaul on the table, legalizing new Democratic voters looms as a threat for conservatives who don't want to hand their political foes a potential windfall of 11.2 million new voters with the creation of a pathway to citizenship -- and to voting rights -- with a comprehensive bill.

"The fear that many people have is that the Democrats aren't interested in border security, that they want this influx," Rush Limbaugh griped during his Tuesday interview with overhaul champion Sen. Marco Rubio of Florida. "For example, if 70 percent of the Hispanic vote went Republican, do you think the Democrats would be for any part of this legislation?"

New immigration policies could mean in influx of new voters, but Republicans needn't worry about it in the short term.

See Also: Gang of Eight Accelerates Immigration Reform Pace

"Under almost any scenario, it's pretty far in the distance," Jeff Passell, senior demographer at the Pew Hispanic Center, said of the prospect that unauthorized immigrants' gaining voting rights would pump up numbers significantly enough to meaningfully change the U.S. electorate.

Whitney Curtis/Getty Images

And yet, the "influx" wouldn't be negligible: "Realistically, we're talking about potentially adding probably 5 million potential voters or so in 10 years," he said.

Hispanic voters broke 71 percent for Obama in November, and Republican strategists recognize that the party has failed to court Hispanic voters effectively. But depending on how slowly the citizenship line moves, the Republican Party will have a decade or so to shake its anti-Hispanic stigma.

See also: A Glossary for Immigration Reform

"It's a long time coming. You're talking about 15 to 20 years before we're talking about a whole slew of new voters coming into the electorate," said Jennifer Korn, executive director of the Hispanic Leadership Network, who served as Hispanic outreach director for George W. Bush's presidential campaign.

"If Republicans can map out and change their positions with things that Hispanics do support -- on less government, lower taxes, less regulations on small businesses -- then they can really compete for the Hispanic vote over the next 20, 30 years."

There are 11.2 unauthorized immigrants living in the United States, according to the Pew Hispanic Center's estimate. While most are of voting age (Pew estimates just 1 million younger than 18), the deluge of new Democratic voters might not be as substantial as Limbaugh implied.

In other words, it's not as if Democrats will gain 11.2 million votes in the next few years. Here are some things to keep in mind:

• Not All Hispanics Vote for Democrats. Most do, but not all, and voter preferences vary from state to state. In Florida, 60 percent of Hispanic voters backed Obama, according to 2012 exit polls; in Arizona, 74 percent voted for the president. Even if all 11.2 million had voted in 2012, Obama would only have picked up North Carolina if they simply hewed to Hispanic voter trends. Romney still would have carried Arizona, Georgia and Texas, although he would have won Georgia by less than 1 percentage point. (Note: There were no exit polls in Texas or Georgia, and here the national rate provides rough estimates of how results would have changed.)

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