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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Israeli raid hit Syrian missiles, buildings: US official

WASHINGTON: An Israeli air raid in Syria this week struck surface-to-air missiles and a nearby military complex on the outskirts of Damascus, as Israel feared the weapons would be transferred to Hezbollah, a US official said Friday.

Earlier reports had suggested Israeli warplanes may have targeted two separate locations in Wednesday's raid in Syria: a military site outside of the capital and a weapons convoy near the Lebanese border.

But the US official said the strike was confined to one location.

"It was in the suburbs of Damascus," the official, who spoke on condition of anonymity, told AFP.

"There were surface-to-air missiles on vehicles" that were targeted by the Israel aircraft, he said, adding that they were believed to be Russian-made SA-17 anti-aircraft missiles.

The planes also bombed an adjacent military complex of buildings suspected of housing chemical agents, the official said.

The Israelis suspected the weapons would be transferred to Lebanon's Shiite Hezbollah group, he said.

The Syrian regime has accused Israel of launching a dawn strike Wednesday on a military research centre in Jamraya, near Damascus, and threatened to retaliate.

But the Israeli government has maintained a public silence on the strike.

Israel has repeatedly expressed concern that Syria's stockpile of chemical weapons could fall into the hands of Lebanon's Shiite Hezbollah group, which is an ally of the Damascus regime, or other militant organisations.

- AFP/jc

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Rarified Retina MacBook Pros get priced closer to earth

13.3- and 15.4-inch Retina MacBook Pros

(Credit:
Apple)

MacBook Pros equipped with a Retina display are not exactly priced to move. Best Buy and Amazon are trying to change that.

Best Buy, for example, is now selling the 128GB version (model MC975LL/A) of the 13.3-inch
MacBook Pro Retina for $1,549.99, $150 off the regular $1,699.99 price.

Need 256GB of solid-state storage with that gorgeous Retina screen? That model (MD213LL/A) is now $1,799.99, $200 off the regular price of $1,999.99.

The pricier 15.4-inch models with 256GB and 512GB solid-state drives (MC975LL/A and MC976LL/A, respectively), also got $200 lopped off their regular prices.

Amazon is going even lower, pricing the 128GB 13.3-inch model at $1,515.59, for example.

The online retailer is offering identical discounts to Best Buy on the 15.4-inch models.

These sales may be short-lived (the Best Buy sale is for two days only) but expect more of this kind of discounting from retailers in the future. Apple's Mac sales sank last quarter to 4.1 million compared to 5.2 million in the same quarter last year.

Some of that is because consumers are opting for the cheaper
iPad, but the Retina MacBook Pros may be a factor too. When Apple sells configurations that push the least expensive Retina model to $1,700 ($1,699) at the regular price, that's not going to win over a lot of buyers.

Best Buy sale: For two days, the 13.3-inch Retina MacBook Pro now starts at $1,549.99.

(Credit:
Best Buy)

[Via 9to5Toys ]

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Best Science Pictures of 2012 Announced

Image courtesy Pupa U.P.A. Gilbert and Christopher E. Killian, U.W. Madison via Science/AAAS

A micrograph, or microphotograph, of a sea urchin's crystalline tooth won first place and people's choice for photography in the 2012 International Science and Engineering Visualization Challenge.

Colors applied with Photoshop reveal the interlocking crystals that form the choppers of Arbacia punctulata. The biomineral crystals, captured by biophysicists from the University of Wisconsin, Madison, grow and intertwine to reinforce and sharpen a sea urchin's teeth. Made of calcite, which is also found in limestone and seashells, the crystals are tough enough to grind holes in rocks to create shelters.

"These winners continue to amaze me every year," said Monica M. Bradford, executive editor of the journal Science, in a statement. "The visuals are not only novel and captivating, but they also draw you into the complex field of science in a simple and understandable way."

Sponsored by Science and the National Science Foundation (NSF), the international competition honors recipients who use visual media to promote understanding of scientific research. Judging criteria included visual impact, effective communication, freshness, and originality. (See some of the 2011 winners.)

—Lacey Gray and Katia Andreassi

Published February 1, 2013

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Arias Trial Puts Mormon Sex Rules in Spotlight

The murder trial of Jodi Arias has been filled with salacious details of phone sex, graphic text messages, and an erotic sexual relationship between her and her devout Mormon ex-boyfriend, Travis Alexander.

Arias, 32, converted to Mormonism when she began to date Alexander, then 29, in 2006. Though they were both outwardly devout, they immediately developed a sexual relationship.

The trial has cast a spotlight on the tight-knit Mormon community in Mesa, Ariz., and its strict social mores, including a ban on premarital sex. According to Patrick Mason, a professor of religion who specializes in Mormon studies at Claremont Graduate University in California, the trial shows the difficulty Mormons face in coping wiith the church's demand for chastity.

"The LDS church puts a really high priority on complete chastity," Mason said. "They define that as no sexual relations of any kind outside of marriage between a man and a woman, no premarital sex and no extramarital sex either, and there's actually a lot of time and attention paid to this."

Arias is on trial for murdering Alexander, whom she dated for a year and then continued to have sex with for a year after that. Prosecutors allege she killed him in a fit of jealousy in June 2008, after taking graphic sexual photos with him and having sex earlier in the day.

Jodi Arias Murder Trial: Former Boyfriend Takes Stand Watch Video

Jodi Arias Murder Trial: Defense's First Day of Witnesses Watch Video

Arias claims she shot and stabbed Alexander in self defense, and her attorneys have focused on Alexander's secret sex life as proof that he was a "sexual deviant" who was abusive and controlling toward Arias.They claim Alexander, who was considered a church elder, kept Arias his "dirty little secret" because sex outside of marriage was against church rules.

See Full Coverage of Jodi Arias Trial

See Jodi Arias Trial Videos
More than anything, Mason said, this case shows the shockwaves sent through Arizona's Mormon community when those values were breached so flagrantly with a violent killing and the web of lies surrounding it. "Mesa is one of those concentrated areas of historic Mormon settlement."

"Were you shocked to learn (Alexander) was not a virgin?" defense attorney Jennifer Willmott asked Lisa Daidone, who dated Alexander after he broke up with Arias. Alexander and Arias continued to sleep together while he dated Daidone.

"Yes," Daidone said on the stand Wednesday. "I believed he was a virgin."

"Was Mr. Alexander living in accordance with his Mormon principles?" defense attorney Kirk Nurmi asked another witness, Daniel Freeman, a Mormon friend of Alexander's in Arizona.

"Yes," Freeman said on the stand Thursday.

"Was there any reason to believe Mr. Alexander was not living up to his Mormon principles as a church elder?"

"No," Freeman said.

Freeman said that Alexander never told him or other church members that he had a sexual relationship with Arias. In fact, Freeman's sister, Desiree Freeman, testified that Alexander made it known he was a virgin when in social settings, and "he joked about it."

The stakes are high for Mormons who choose to have sex, Mason said. They can face excommunication or a tarnished reputation among their closest friends and family members.

"In Mormonism, if you're not married, your social capital is largely defined by preserving your virginity. If it is known that you've had sex before marriage, even if people try to be compassionate and not judgmental, there is no doubt that in Mormon communities and the eyes of other Mormons... it lessens your social standing."

The conflict between Alexander's outer appearances and his secret sexual trysts with Arias is key to the defense's strategy of painting him as an abusive lover. But the testimony has also shown, conversely, how sexually conservative and pure many young Mormons in America are.

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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

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Candidates to head WTO clear hurdle

GENEVA: The last of a record nine candidates to lead the World Trade Organization finished defending their candidacies on Thursday, but the real campaign is only just getting started.

"This is a procedure that is all but unique in the world -- a selection rather than an election that takes several months to complete," a source close to the process told AFP.

The candidates -- six men and three women mainly from developing nations -- are all considered confirmed global trade specialists and are vying to replace Frenchman Pascal Lamy, who finishes his second four-year term in August.

This past week, they have all gone before the WTO's general council for gruelling questioning about their merits and visions for the organisation, which oversees global trade practices and is trying to reduce tariffs that hobble exchanges.

The interviews took place behind closed doors, but in subsequent news conferences all the candidates stressed the urgency in addressing the WTO's main challenge: jump starting the stalled Doha Round of trade talks that was launched in 2001.

"The reality is that the round at this point in time is paralysing the system, and we have to solve it," insisted Brazil's envoy to the WTO Roberto Azevedo, who was one of three candidates from Latin America -- a heavily-tipped region to land the organisation's top job -- and the last of the nine to face the fire.

South Korean Trade Minister Taeho Bark, the only other candidate who spoke Thursday, agreed, insisting that "there's a need to rebuild trust."

On Wednesday, New Zealand Trade Minister Tim Groser, the only candidate from an advanced economy and therefore considered a longshot since the UN's trade body appears set on picking someone from a developing nation, stressed that the WTO was facing a "problem of relevance."

Mexican economist and former minister Herminio Blanco Mendoza also cautioned Wednesday that the WTO risked "losing relevance" if the next Doha-round talks in Bali at the end of the year failed.

Former Jordanian trade minister Ahmad Thougan Hindawi, the only Middle Eastern candidate, also spoke Wednesday of a need of "a fresh outside look" to get the process moving.

"After 12 years of stalled negotiations, to think of modernising," agreed high-level United Nations executive Amina Mohamed of Kenya, one of two candidates from Africa -- a region also thought likely to provide the organisation's next leader.

While insisting that her candidacy was purely based on merit, Mohamed said that "it would send a very, very powerful signal ... if this organisation decided that a woman, preferably an African woman, should take over at the helm of the WTO."

Indonesia's current tourism minister and former trade minister Mari Elka Pangestu, who might have less of a chance given that Lamy's predecessor Supachai Panitchpakdi comes from neighbouring Thailand, also told media on the first day of interviews Tuesday that the WTO would be well-served by having a woman at the top.

The third woman who has thrown her hat in the ring, Costa Rica's Foreign Trade Minister Anabel Gonzalez, meanwhile said she was a "cautious optimist" that the WTO would get the Doha round on track.

Ghana's former trade minister Alan John Kwadwo Kyerematen, who was the first to make his case on Tuesday, also spoke of the need to "revitalise an extremely important organisation."

As the interview process wrapped up Thursday, the candidates were preparing three months of world travel to convince the 158 WTO member states of their merits.

The final selection will be made by a "troika" composed of the yet-to-be-picked presidents of the WTO's general council, its Dispute Settlement Body and its Trade Policy Review Board.

Once the three leaders have been chosen, something that must happen by the end of February, the troika will ask each member state to provide their two favourite candidates, as well as the one they are most opposed to.

Based on the responses they receive, the three WTO leaders will gradually begin dropping candidates, with the ones who stand little chance of being selected expected to withdraw of their own volition.

The decision must be made no later than May 31, and the nominee is to take over at the WTO on September 1.

- AFP/jc

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Smart LED desk lamp is sensitive to your moods

It's more than just a lamp.

(Credit:
Satechi)

The day of the single-purpose gadget is rapidly fading. You can't just have a phone that you use to talk to other people. It has to do 50 other things. You can't just have a desk lamp that lights up your desk. You have to have one that charges your phone and gives you mood lighting, too.

The Satechi Smart LED Desk Lamp tries to fit as much functionality in as it can. It charges smartphones and has a built-in timer to power it off. It's also very touchy-feely. It's controlled through a touch panel and has different lighting modes to fit your mood.

The lamp can be dimmed in increments, or you can choose one of four pre-sets. Reading mode features a mid-range color temperature to be easy on your eyes. Study mode has high-range color temperature, supposedly to increase concentration. Relaxation mode brings low-range color temperature to encourage you to kick back. Bedtime mode has a soft light for people who like to sleep at their desks.

Phone charging functions aren't new to desk lamps. Konica Minolta came out with wireless charging lamp late last year. The Satechi lamp doesn't do wireless, but at $100, it's $200 cheaper than the Konica Minolta. If you're the kind of person who's not satisfied with single-function devices, then the Satechi lamp could be worth a look.

Charge your phone while relaxing with your mood lighting.

(Credit:
Satechi)

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14 Pygmy Elephants Die Mysteriously in Borneo

Fourteen endangered Borneo pygmy elephants have recently been found dead in a Malaysian forest, presenting a mystery for wildlife officials and conservationists.

The recent deaths highlight the vulnerable status of the species, which now numbers about 1,500 animals. Scientists don't know how many pygmy elephants previously existed on the island, although it's likely the population wasn't much higher than it is today, said Barney Long, head of Asian species conservation at WWF-US.

This week Malaysian authorities discovered a group of elephant carcasses close together in the Gunung Rara Forest Reserve, located in the northeastern corner of Borneo (map), a Southeast Asian island shared by Indonesia, Malaysia, and Brunei.

"We don't know officially yet how they died, but what we do know is this is an area of forest that is being cleared for plantations, and it's very common that when the forest is cleared, conflict between humans and elephants spikes," said Long.

For instance, in agricultural areas in neighboring Sumatra, people have put out poisoned fruit for elephants to eat, causing a whole herd to drop dead in one area. The poison is usually whatever is locally available, such as rodenticide, he said.

"The presumption here is that [the recent deaths are] similar to that. Obviously that is complete guesswork until we have results of the autopsies," Long said.

The Malaysian government is performing autopsies on the dead elephants, although it's unknown when they will release the results, he added.

Cute Elephant Dwindling in Number

Pygmy elephants were isolated about 300,000 years ago from their relatives on mainland Asia and Sumatra and evolved their small size to adapt to forest living.

With their baby faces, oversize ears, and plump bellies, "Walt Disney himself couldn't have crafted a cuter elephant," according to WWF's website. (Visit National Geographic's elephant hub.)

But the population of this charismatic mini-elephant is dwindling in number as large tracts of Borneo's forests are cleared to make way for palm oil plantations, restricting the animals to increasingly smaller areas and forcing them into closer contact with people. (Get more elephant news on the National Geographic blog A Voice For Elephants.)

For example, the mammals need about 115 square miles (300 square kilometers) in which to find enough food, water, and minerals, according to WWF's studies of elephants fitted with radio collars.

"When you chop down part of their habitat, they're still going back there looking for resources that used to be there," Long said.

And if that happens to be a plantation, that's when run-ins with people occur.

Pygmy Elephants Need Protection

Whatever caused the recent deaths, the incident has prompted WWF to call on the Malaysian government to better protect pygmy elephants. (Also see "'Extinct' Pygmy Elephants Found Living on Borneo.")

For one, the species needs to be listed as "totally protected" by law in Malaysia, which has been recommended by scientists but not yet enacted by the government, WWF-Malaysia executive director Dionysius S.K. Sharma said in a statement.

Though the animals are already protected from hunting, the huge swaths of habitat they rely on also need to be set aside from logging.

What's more, the local wildlife department needs to invest more resources in patrolling the area for illegal activities, Sharma said.

"Frequent and large-scale patrolling is critical to avoid such conflict from happening again," he said.

Though the killings won't be disastrous for the population overall, noted WWF-US's Long, what it is showing "is a huge pressure on elephants."

"If this is a case of poisoning, [it shows] how easy it is for one individual to wipe out a significant number [of elephants]."

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Arias' Ex-Boyfriend Kept Affair Secret

Accused murderer Jodi Arias was kept away from the Mormon friends of her lover Travis Alexander and their torrid sex affair was kept secret by Alexander, even as he sent lewd photos of himself to her online, according to court testimony today.

The testimony in Arias' trial for killing Alexander in 2008 was intended to bolster the defense's argument that she killed him in self defense, that Alexander was a sexual deviant who treated Arias as his "dirty little secret."

Arias' attorneys introduced as evidence photos that Alexadner took of his penis and sent to Arias, part of a string of graphic messages and sexual phone calls the two engaged in while Alexander, an elder in the Mormon church, was supposed to be chaste.

Today's witness was the latest in a string called by the defense, including Alexander's former girlfriend Lisa Daidone, who told the court that Alexander had professed to be a virgin.

Daniel Freeman continued his testimony today, describing how he was a friend of both Arias and Alexander but that Alexander kept Arias distanced from his Mormon pals.

"Travis had made more friends at (the Mormon) ward, and had (Ultimate Fighting Championship) fight nights at his house many times, and Jodi was in town, but she wasn't there," Freeman said.

"There was that group of friends, them and Jodi, two different groups, and so Lisa [Daidone] and friends from church were there, but Jodi wasn't there," Freeman said.

Jodi Arias Murder Trial: Former Boyfriend Takes Stand Watch Video

Jodi Arias Murder Trial: Defense's First Day of Witnesses Watch Video

Alexander's behavior, the defense hopes to prove, shows that he mistreated Arias.

Arias, 32, is on trial for murdering Alexander, whom she dated for a year and continued to have a sexual relationship for a year after that. Her attorneys claim that Alexander was abusive and controlling toward Arias, and that she was forced to kill him.

Freeman described how he took a trip with his sister, Alexander, and Arias, and how Alexander had asked him to come along so that he and Arias "would not get physical."

"I don't know that I can say he didn't want to be alone with her, but he liked that when I was there, and my sister was there. They weren't as physical," Freeman said.

Freeman admitted that he had no idea Alexander and Arias had been having a sexual relationship the entire time they were together. He said Alexander never mentioned that to his friends.

In fact, Freeman noted that Alexander was considered to be a church elder when he baptized Arias into the Church of Latter-Day Saints. Both a church elder and a convert were expected to abide by the church's strict law of chastity, which banned any sexual relations outside of marriage.

"One thing people give up in this baptism process was sex," prosecutor Juan Martinez said. "Did you know she was having oral sex with Mr. Alexander at the time of her baptism? Would that be an insincere baptism?"

"She would not be ready to be baptized in that case," Freeman said.

"You were asked about Miss Arias, whether she was worthy of baptism if she was performing oral sex, but what about the elder receiving oral sex?" defense attorney Kirk Nurmi said.

"They would not be worthy of performing that ordinance at that time until they had gone through repentance," Freeman said. "They would go to a discipline council and could face excommunication or a probation period or have their priesthood removed."

Freeman said that Alexander never confessed to having a sexual relationship with Arias.

Freeman's testimony came on the third day of the defense's attempt to paint Alexander as a controlling, sex-obsessed liar who was cruel to Arias. Other witnesses have said that Alexander cheated on other women he dated with Arias, and lied to his friends and family about their relationship.

The defense also had Freeman point out that Alexander was strong and fit. They are expected to conclude that Alexander was physically threatening Arias when she killed him.

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