Asteroid to Make Closest Flyby in History

Talk about too close for comfort. In a rare cosmic encounter, an asteroid will barnstorm Earth next week, missing our planet by a mere 17,200 miles (27,700 kilometers).

Designated 2012 DA14, the space rock is approximately 150 feet (45 meters) across, and astronomers are certain it will zip harmlessly past our planet on February 15—but not before making history. It will pass within the orbits of many communications satellites, making it the closest flyby on record. (Read about one of the largest asteroids to fly by Earth.)

"This is indeed a remarkably close approach for an asteroid this size," said Paul Chodas, a research scientist at NASA's Jet Propulsion Laboratory Near Earth Object (NEO) program office in Pasadena, California.

"We estimate that an asteroid of this size passes this close to the Earth only once every few decades."

The giant rock—half a football field wide—was first spotted by observers at the La Sagra Observatory in southern Spain a year ago, soon after it had just finished making a much more distant pass of the Earth at 2.6 million miles (4.3 million kilometers) away.

This time around however, on February15 at 2:24 pm EST, the asteroid will be passing uncomfortably close—ten times closer than the orbit of the moon—flying over the eastern Indian Ocean near Sumatra (map). (Watch: "Moon 101.")

Future Impact?

Chodas and his team have been keeping a close eye on the cosmic intruder, and orbital calculations of its trajectory show that there is no chance for impact.

But the researchers have not yet ruled out future chances of a collision. This is because asteroids of this size are too faint to be detected until they come quite close to the Earth, said Chodas.

"There is still a tiny chance that it might hit us on some future passage by the Earth; for example there is [a] 1-in-200,000 chance that it could hit us in the year 2080," he said.

"But even that tiny chance will probably go away within the week, as the asteroid's orbit gets tracked with greater and greater accuracy and we can eliminate that possibility."

Earth collision with an object of this size is expected to occur every 1,200 years on average, said Donald Yeomans, NEO program manager, at a NASA news conference this week.

DA14 has been getting closer and closer to Earth for quite a while—but this is the asteroid's closest approach in the past hundred years. And it probably won't get this close again for at least another century, added Yeomans.

While no Earth impact is possible next week, DA14 will pass 5,000 miles inside the ring of orbiting geosynchronous weather and communications satellites; so all eyes are watching the space rock's exact trajectory. (Learn about the history of satellites.)

"It's highly unlikely they will be threatened, but NASA is working with satellite providers, making them aware of the asteroid's pass," said Yeomans.

Packing a Punch

Experts say an impact from an object this size would have the explosive power of a few megatons of TNT, causing localized destruction—similar to what occurred in Siberia in 1908.

In what's known as the "Tunguska event," an asteroid is thought to have created an airburst explosion which flattened about 750 square miles (1,200 square kilometers) of a remote forested region in what is now northern Russia (map).

In comparison, an impact from an asteroid with a diameter of about half a mile (one kilometer) could temporarily change global climate and kill millions of people if it hit a populated area.

Timothy Spahr, director of the Minor Planet Center at Cambridge, Massachusetts, said that while small objects like DA14 could hit Earth once a millennia or so, the largest and most destructive impacts have already been catalogued.

"Objects of the size that caused the extinction of the dinosaurs have all been discovered," said Spahr. (Learn about what really happened to the dinosaurs.)

A survey of nearly 9,500 near-Earth objects half a mile (one kilometer) in diameter is nearly complete. Asteroid hunters expect to complete nearly half of a survey of asteroids several hundred feet in diameter in the coming years.

"With the existing assets we have, discovering asteroids rapidly and routinely, I continue to expect the world to be safe from impacts in the future," added Spahr.

Read More..

Alleged Cop-Killer Has Calif. Region on Edge

The truck owned and driven by suspected cop killer Christopher Dorner during his alleged rampage through the Los Angeles area was found deserted and in flames on the side of Bear Mountain, Calif., this afternoon.

Heavily armed SWAT team members descended onto Bear Mountain from a helicopter manned with snipers today to investigate the fire. The San Bernadino Sheriff's Department confirmed the car was Dorner's.

Dorner, a former Los Angeles police officer and Navy reservist, is believed to have killed one police officer and injured two others early this morning in Riverside, Calif. He is also accused of killing two civilians on Sunday after releasing a scathing "manifesto" alleging grievances committed by the police department while he worked for it and warning of coming violence toward cops.

Heavily armed officers spent much of Thursday searching for signs of Dorner, investigating multiple false leads into his whereabouts and broadcasting his license plate and vehicle description across the California Highway System.

Around 3:45 p.m. ET, police responded to Bear Mountain, where two fires were reported, and set up a staging area in the parking lot of a ski resort. They did not immediately investigate the fires, but sent a small team of heavily armed officers up in the helicopter to descend down the mountain toward the fire.

Christopher Dorner: Ex-Cop Wanted in Killing Spree Watch Video

Engaged California Couple Found Dead in Car Watch Video

Missing Ohio Mother: Manhunt for Ex-Boyfriend Watch Video

The officers, carrying machine guns and searching the mountain for any sign of Dorner, eventually made it to the vehicle and identified it as belonging to Dorner. They have not yet found Dorner.

Late this afternoon, CNN announced that Dorner had sent a package containing his manifesto and a DVD to its offices.

Police officers across Southern California were on the defensive today, scaling back their public exposure, no longer responding to "barking-dog calls" and donning tactical gear outdoors.

Police departments have stationed officers in tactical gear outside police departments, stopped answering low-level calls and pulled motorcycle patrols off the road in order to protect officers who might be targets of Dorner's alleged rampage.

"We've made certain modifications of our deployments, our deviations today, and I want to leave it at that, and also to our responses," said Chief Sergio Diaz of the police department in Riverside, Calif., where the officers were shot. "We are concentrating on calls for service that are of a high priority, threats to public safety, we're not going to go on barking dog calls today."

Sgt. Rudy Lopez of the Los Angeles Police Department said Dorner is "believed to be armed and extremely dangerous."

Early Thursday morning, before they believe he shot at any police officers, Dorner allegedly went to a yacht club near San Diego, where police say he attempted to steal a boat and flee to Mexico.

He aborted the attempted theft when the boat's propeller became entangled in a rope, law enforcement officials said. It was then that he is believed to have headed to Riverside, where he allegedly shot two police officers.

"He pointed a handgun at the victim [at the yacht club] and demanded the boat," said Lt. David Rohowits of the San Diego Police Department.

Police say the rifle marksman shot at four officers in two incidents overnight, hitting three of them: one in Corona, Calif., and the two in Riverside, Calif.

Read More..

Football: Bengtson lifts Honduras over US

SAN PEDRO SULA, Honduras: Jerry Bengtson scored in the 79th minute to give Honduras a 2-1 victory over the United States on Wednesday in the North American qualifying final-round opener for the 2014 Brazil World Cup.

The New England Revolution striker knocked in the decider, aided by a blunder from a US defensive unit with relatively few World Cup qualifying caps while American veteran Carlos Bocanegra was watching from the bench.

Juan Carlos Garcia netted a spectacular bicycle kick for Honduras to equalise in the 39th minute after the visitors had seized the lead on a goal by Tottenham's Clint Dempsey in the 36th.

The critical stretch began when Oscar Garcia pushed the ball past US defender Geoff Cameron, who plays for Stoke City in England.

US goalkeeper Tim Howard, who plays for English side Everton, came after the ball but Garcia flicked the ball past him into the empty penalty area where an onrushing Bengtson kicked it home before a sliding Omar Gonzalez could stop him.

Juan Carlos Garcia, a 24-year-old left back, made a spectacular bicycle-kick goal in the 39th minute that pulled Honduras level 1-1 at half-time.

Maynor Figueroa took a centering pass on the chest and deflected the ball into the crowded heart of the penalty area, where Garcia made an incredible somersault and followed with a hammering kick past Howard.

Dempsey put the Americans ahead 1-0 by taking a perfect lob centering pass from Jermaine Jones in full stride while leaping into the air on a run midway through the penalty area.

Without an instant's pause, Dempsey blasted the ball past Honduran goalkeeper Noel Valladares to open the scoring.

Other regional qualifiers on Wednesday find Jamaica at Mexico and Costa Rica at Panama.

The three top teams after Confederation of North, Central American and Caribbean Association Football (CONCACAF) round-robin matches will qualify for Brazil. The fourth-place team will face a team from Oceania for another berth.

- AFP/de

Read More..

CBI finds it difficult to close fodder scam cases

RANCHI: The CBI is facing tough time in taking the five cases of the fodder scam in which two former chief ministers of Bihar, Lalu Prasad and Jagannath Mishra were involved, to their logical end.

Special public prosecutors of the CBI dealing the five cases said by using the provisions of law and the loopholes both Prasad and Mishra had dragged the cases for years. Of the 53 cases, the CBI has finished trial and courts have convicted the accused in 43 cases in the past 17 years. The cases were lodged in Rs 900-crore scam in 1996 at the time of united Bihar.

The CBI officials and advocates, who were planning to end the trial of at least one of the five cases in 2012, are now doubtful if they will be able to end it even this year. Of the 10 cases in which trial has to be completed, five are related to Prasad.

"In one of the cases (RC 20) which is related to fraudulent withdrawal of around Rs 37 crore from the Chaibasa (West Singhbhum) treasury where the trial is at its fag end, Prasad is dragging it in the name of producing defence witnesses who are not in India. The way they are dragging the case by opposing the move of CBI in higher judiciary, we are doubtful about when the case will end," said a special public prosecutor.

The other four cases in which Lalu Prasad and other high profile people are accused includes RC 38, 47, 64 and 86

are at evidence stage. "If the high profile politicians don't drag the cases, we can expect judgment by end of this year or early next year," said a public prosecutor.

Read More..

Humans Swap DNA More Readily Than They Swap Stories

Jane J. Lee

Once upon a time, someone in 14th-century Europe told a tale of two girls—a kind one who was rewarded for her manners and willingness to work hard, and an unkind girl who was punished for her greed and selfishness.

This version was part of a long line of variations that eventually spread throughout Europe, finding their way into the Brothers Grimm fairytales as Frau Holle, and even into Shakespeare's The Merchant of Venice. (Watch a video of the Frau Holle fairytale.)

In a new study, evolutionary psychologist Quentin Atkinson is using the popular tale of the kind and unkind girls to study how human culture differs within and between groups, and how easily the story moved from one group to another.

Atkinson, of the University of Auckland in New Zealand, and his co-authors employed tools normally used to study genetic variation within a species, such as people, to look at variations in this folktale throughout Europe.

The researchers found that there were significant differences in the folktale between ethnolinguistic groups—or groups bound together by language and ethnicity. From this, the scientists concluded that it's much harder for cultural information to move between groups than it is for genes.

The study, published February 5 in Proceedings of the Royal Society B, found that about 9 percent of the variation in the tale of the two girls occurred between ethnolinguistic groups. Previous studies looking at the genetic diversity across groups in Europe found levels of variation less than one percent.

For example, there's a part of the story in which the girls meet a witch who asks them to perform some chores. In different renditions of the tale, the meeting took place by a river, at the bottom of a well, or in a cave. Other versions had the girls meeting with three old men or the Virgin Mary, said Atkinson.

Conformity

Researchers have viewed human culture through the lens of genetics for decades, said Atkinson. "It's a fair comparison in the sense that it's just variation across human groups."

But unlike genes, which move into a population relatively easily and can propagate randomly, it's harder for new ideas to take hold in a group, he said. Even if a tale can bridge the "ethnolinguistic boundary," there are still forces that might work against a new cultural variation that wouldn't necessarily affect genes.

"Humans don't copy the ideas they hear randomly," Atkinson said. "We don't just choose ... the first story we hear and pass it on.

"We show what's called a conformist bias—we'll tend to aggregate across what we think everyone else in the population is doing," he explained. If someone comes along and tells a story a little differently, most likely, people will ignore those differences and tell the story like everyone else is telling it.

"That makes it more difficult for new ideas to come in," Atkinson said.

Cultural Boundaries

Atkinson and his colleagues found that if two versions of the folktale were found only six miles (ten kilometers) away from each other but came from different ethnolinguistic groups, such as the French and the Germans, then those versions were as different from each other as two versions taken from within the same group—say just the Germans—located 62 miles (100 kilometers) away from each other.

"To me, the take-home message is that cultural groups strongly constrain the flow of information, and this enables them to develop highly local cultural traditions and norms," said Mark Pagel, of the University of Reading in the U.K., who wasn't involved in the new study.

Pagel, who studies the evolution of human behavior, said by email that he views cultural groups almost like biological species. But these groups, which he calls "cultural survival vehicles," are more powerful in some ways than our genes.

That's because when immigrants from a particular cultural group move into a new one, they bring genetic diversity that, if the immigrants have children, get mixed around, changing the new population's gene pool. But the new population's culture doesn't necessarily change.

Atkinson plans to keep using the tools of the population-genetics trade to see if the patterns he found in the variations of the kind and unkind girls hold true for other folktale variants in Europe and around the world.

Humans do a lot of interesting things, Atkinson said. "[And] the most interesting things aren't coded in our DNA."

Read More..

Galaxy May Be Full of 'Second Earths'

You may look out on a starry night and get a lonely feeling, but astronomers now say our Milky Way galaxy may be thick with planets much like Earth -- perhaps 4.5 billion of them, according to the Harvard-Smithsonian Center for Astrophysics.

Astronomers looked at data from NASA's Kepler space telescope in orbit, and conclude that 6 percent of the red dwarf stars in the Milky Way probably have Earth-like, habitable planets. That's a lot by space standards, and since red dwarfs are very common -- they make up three out of four stars in our part of the galaxy -- we may have a lot more neighbors than we thought.

The nearest of them, astronomers said today, could be 13 light-years away -- not exactly commuting distance, since a light-year is six trillion miles, but a lot closer than most yellow stars like Earth's sun.

Video: Are We Alone? Kepler's Mission

David A. Aguilar/Harvard-Smithsonian Center for Astrophysics

"We thought we would have to search vast distances to find an Earth-like planet. Now we realize another Earth is probably in our own backyard, waiting to be spotted," said Courtney Dressing, an astronomer at the Harvard-Smithsonian Center, in announcing the findings today. The results will be published in The Astrophysical Journal.

David Charbonneau, a co-author, said, "We now know the rate of occurrence of habitable planets around the most common stars in our galaxy. That rate implies that it will be significantly easier to search for life beyond the solar system than we previously thought."

Red dwarfs are older, smaller and dimmer than our sun, but a planet orbiting close to one could be sufficiently warmed to have liquid water. Dressing and her colleagues cited three possible planets that were spotted by Kepler, which was launched in 2009. One is 90 percent as large as Earth, and orbits its red sun in just 20 of our days.

There is no saying what such a world would actually be like; the Kepler probe can only show whether distant stars have objects periodically passing in front of them. But based on that, scientists can do some math and estimate the mass and orbit of these possible planets. So far, Kepler has spotted more than 2,700 of them in the small patch of sky it has been watching.

There are estimated to be 200 to 400 billion stars in the Milky Way -- which is probably a pretty average galaxy. So the new estimate implies a universe with tremendous numbers of Earth-like planets, far beyond our ability to count.

Pictures: Final Frontier: Images From the Distant Universe

Could they be friendly to life? There's no way to know yet, but space scientists say that if you have the right ingredients -- a planet the right size, temperatures that allow for liquid water, organic molecules and so forth -- and the chances may be good, even on a planet that is very different from ours.

"You don't need an Earth clone to have life," said Dressing.

Read More..

Strengthening security at the nation’s airports

Most people think of airport security as their walk through the metal detector and the eyeballing by transportation security officers (TSOs). Dan Liddell, whose job it is to protect the flying public at seven airports in central New York, instead sees 17 zones of worker responsibility and hundreds of different tasks.

In pursuit of safeguarding the public, Liddell, a federal security director based in Syracuse, has written a book that is now used to train TSOs. It’s called the “National Standardization Guide to Improving Security Effectiveness.” Tasks at each duty area have been inventoried and cataloged, and the “knowledge, values and skills” associated with the airport security jobs have been identified under what Liddell describes as a systems approach to training.

As important as it is to use X-ray machines and explosive trace-detection equipment and to have the correct rules and procedures in place, Liddell said transportation security relies on the skills of the people responsible for it.

“People performance is the cornerstone,” he said. “When I set out to improve things, I look at the people. I look at their proficiency, their skill in doing something and how well they’re doing that job.”

Even when people have the skills to do their jobs, they don’t necessarily do them well each time, especially when conditions can vary with each day and every passenger. To keep performance high, TSOs are tested covertly at unexpected times. A banned item will be sent through a checkpoint and the reaction and activities that take place are monitored.

Whether or not TSOs spot contraband, everyone at that checkpoint during the test participates in an “after-action” review. “It’s the learning experience that’s relevant,” Liddell said. “We’re doing a review of actual performance and you can always improve.”

Liddell is sensitive to the pressure that airport security personnel face. TSOs have the tough of performing multiple tasks under constant camera surveillance and public scrutiny, often interacting with tired or irritated travelers. The testing and training helps them continually up their game.

Thirty airports around the country that helped test the training system and now use a version of it. Paul Armes, federal security director at Nashville International Airport, was interested in creating such a system with a colleague when they both worked in Arizona, but it “never got traction.”

When he learned about what Liddell was doing, he was eager to participate. “Typical of Dan, he built it himself and practiced it so he had hard metric results, and then he started reaching out to some of us, working with his counterparts around the country to get a good representative sample,” Armes said. “He sees things others don’t see sometimes and he has the capability to drill down into the details.”

Liddell began the “pretty long process” of analyzing how people were performing at checkpoints in 2009. He sat down with subject-matter experts to produce the task inventory he now uses. In 2010, he improved the review and reporting process that occurs after covert tests events and instituted the security practices he refined at the other New York airports he oversees, including Greater Binghamton, Ithaca and four others. “I love breaking it down,” he said. “I’ve got a quest for improvement.”

In a less sneaky version of the television show, “Undercover Boss,” Liddell went through the new-hire training program for his employees to understand as much as he could about the jobs and the training provided for them, he said.

If pursuing knowledge is in Liddell’s genes, it may be because his parents were both in education. His father was a high school principal and his mother was a fifth-grade teacher. His teaching manifested itself instead in the training realm, where he strives to educate security employees as effectively as possible, inside the classroom and out.

“It’s always a challenge to meet that right balance of really great effectiveness and really great efficiency,” he said. “There are always challenges. It’s what gets me up in the morning, trying to improve.”

This article was jointly prepared by the Partnership for Public Service, a group seeking to enhance the performance of the federal government, and washingtonpost.com. Go to http://washingtonpost.com/wp-srv/politics/fedpage/players/ to read about other federal workers who are making a difference.

Read More..

Passion in US lower house immigration debate

WASHINGTON: US lawmakers debated plans on Tuesday to build a pathway to citizenship for millions of immigrants who remade their lives in America but found themselves at the heart of a fierce debate.

President Barack Obama and a group of Republican and Democratic senators have submitted plans for reform, but as the House of Representatives took up the issue, there were signs the bipartisan facade is coming under strain.

While from the Democratic side of the aisle, a rising Hispanic-American political star made an impassioned plea to fix a broken system, more senior Republicans warned against pushing too fast for change.

"Immigration is more than a political issue. It's who we are," said Julian Castro, the charismatic young mayor of San Antonio, Texas who had a star turn last year on the stage of the Democratic National Convention.

"Immigrants have made ours the greatest country in the world," he told a packed House Judiciary Committee hearing. "Doing nothing is not an option."

But Bob Goodlatte, chairman of the committee, warned against a "rush to judgment" -- despite concerns among his Republican colleagues that they have lost the support of a generation of Hispanic and Asian voters.

"I think we can all agree that our nation's immigration system is in desperate need of repair and it is not working as efficiently and fairly as it should be," he told the first of several hearings on the issue.

Goodlatte warned his panel "needs to take the time to learn from the past so our efforts to reform our immigration laws do not repeat the same mistakes."

The burst of activity on Capitol Hill marks the best chance in years to craft legislation to tighten border security, improve employment verification and bring some 11 million illegal immigrants out of limbo.

A 2007 effort spearheaded by then-president George W. Bush failed.

Obama and top Republicans are for once in agreement that political and demographic trends have suddenly shifted to offer the best chance for serious reform in a generation.

November's election saw Obama re-elected with 70 percent backing from Hispanic American voters -- many of whom have friends or relatives seeking papers.

It shook Republicans into realizing that their tough stance on immigration had driven Hispanics away from the party, and party luminaries like Senator Marco Rubio have come out strongly in favor of immigration reform.

But differences remain, particularly in the contentious issue of how to accommodate the millions who entered the country without permission, or who came in legally but overstayed their visas.

The issue bubbled over in the hearing room when about eight protesters stood up with fists raised, and chanted "undocumented and unafraid!" for about 30 seconds before walking out.

Castro said a pathway to citizenship, similar to the one proposed by the bipartisan group of senators last month, was crucial in order to bring 11 million undocumented immigrants "out of the shadows and into the full light of the American dream."

Republican Goodlatte pushed back, seeking to carve a possible compromise option short of full citizenship for those who entered illegally or stayed beyond their visa.

"Are there options that we should consider between the extremes of mass deportation and a pathway to citizenship for those not lawfully present in the United States?" Goodlatte asked.

Democratic congresswoman Zoe Lofgren, a former immigration lawyer from California, conceded the system was dysfunctional, but that "partial legalization, as some are suggesting, is a dangerous path."

She argued that merely providing undocumented workers with legal status but no way to work towards full citizenship could create a "permanent underclass," while kicking the undocumented out en masse would trigger economic chaos.

With up to 90 percent of the estimated two million migrant farm workers in the country illegally, "you could do e-verify and find out they're not properly here and American agriculture would collapse."

Obama addressed the immigration issue Tuesday as well, hosting meetings with more than two dozen progressive leaders and business executives.

Steve Case, co-founder of America Online, said he was encouraged by the discussion at the White House.

"The president and his team listened to numerous proposals, outlined many of their own and expressed a desire to build a bipartisan consensus regarding comprehensive immigration reform," Case said.

-AFP/ac

Read More..

Railways seeks Cabinet nod for two key links to Chhattisgarh

NEW DELHI: In a bid to ensure connectivity to coal fields to ensure fuel supply to power plants, railways has sought Cabinet approval for construction of two crucial rail links in Chhattisgarh. Both these projects have been pending for long.

The proposed rail links —122-km Gevra Road-Pendra Road and 63-km Raigarh (Mand colliery)-Bhupdeopur stretches — is part of an ambitious project aimed at ensuring smooth movement of freight, including coal.

The Cabinet's approval has also been sought for doubling of 248-km-long Palanpur-Samakhiali link, which will help industries in Gujarat's Kutch area to transport goods in time.

The project is expected to cater to immense potential of bulk traffic from port as well as from the Kutch region.

For Chhattisgarh projects, railways had signed MoU with state government and South Eastern Coalfields for construction of about 300 km of rail network.

The projects — East Corridor and East-West Corridor — would come up at an estimated cost of Rs 4,000 crore. The East Corridor will be about 180 km, stretching from Bhupdeopur-Gharghoda-Dharamjaygarh upto Korba and the 122-km-long East-West Corridor will be from Gevra Road to Pendra Road.

The move came at a time when coal ministry had warned of severe shortage of the mineral for thermal power plants across the country, if railway links to connect coal fields in Jharkhand, Odisha and Chhattisgarh are not completed within next three years.

The Mand Raigarh coalfield also holds a potential of 100 metric tonnes per annum.

The coal ministry has been arguing that it would not be possible for the Coal India Limited (CIL) to achieve either the targeted production of 615 million tonnes of coal by 2016-17 or any incremental coal production during the 12th Five Year Plan if the rail tracks in coal-producing states of Chhattisgarh, Jharkhand and Odisha are not put in place within the next three years.

It was pointed out that western states like Rajasthan, Maharashtra and Gujarat will suffer if the proposed railway line in Chhattisgarh does not materialize.

The delay in getting clearances for these rail lines has left the Prime Minister's Office (PMO) worried. According to sources, the PMO has given direction to fast track the construction of these railway tracks.

Read More..

Life Found Deep Under Antarctic Ice For First Time?

For the first time, scientists believe they have collected life-forms from deep under the Antarctic ice.

Last week, a team found and collected microbes in a lake hidden under more than a half-mile of ice. (Related: "Race Is On to Find Life Under Antarctic Ice.")

Among other things, the discovery may shed light on what lies under the icy moons of Jupiter and Saturn.

The newfound life-forms have little connection to life on the earth's surface and many apparently survive by "eating rocks," team member Brent Christner said in an interview from the U.S. McMurdo Station, after spending several weeks working at a remote field site at Lake Whillans.

That may explain how life on other celestial objects—such as on the moons of Jupiter and Saturn—survive in the absence of available carbon.

"The conditions faced by organisms in Lake Whillans are quite parallel to what we think it would be like on those icy moons," Christner said.

"What we found tells us a lot about extreme life on Earth," and how similar life beyond Earth might survive.

Making a Living in Ice

A 50-member U.S. team broke through to the 20-square-mile (50-square-kilometer) subglacial lake on January 28, and had two days of 24-hour sunlight to bring up samples before the borehole began to close. A day of reaming the hole was followed by two more days of sample collection.

The scientists are now returning with a four-day haul of lake water, lake bottom sediments, and hundreds of dishes of living organisms that are being cultured for intensive study in the United States.

An early task will be to make sure the newfound microbes were not introduced while drilling through the ice into the lake, which involved a hot-water drilling technique designed to greatly reduce or eliminate any contamination that might come from other kerosene-based drilling technology, Christner said.

Christner said that a commonly used dye was added to the water to illuminate the DNA of the microscopic organisms, and a substantial green glow told scientists that microbes were indeed present. Many of the organisms are likely chemolithotrophs, which rely on inorganic compounds of iron, sulfur, and other elements for nourishment.

Montana State's John Priscu, chief biologist of the Whillans Ice Stream Subglacial Access Research Drilling (WISSARD) program, said lab work at the drill site determined that microbial cells were present—and that they were alive. (Take an Antarctic quiz.)

"I believe it is safe to say that subglacial lake beneath the Whillans Ice Stream supports a microbial assemblage that is growing within this dark and cold habitat" of 31 degrees Fahrenheit (-0.5 Celsius), he wrote in an email.

DNA sequencing in the U.S. "will tell us who they are and, together with other experiments, tell us how they make a living."

Hidden Lakes

The U.S. team is one of three digging into what is now known to be a vast system of lakes and streams deep below the surface of Antarctica. (See "Chain of Cascading Lakes Discovered Under Antarctica.")

A British team attempting to drill into much deeper Lake Ellsworth had to return home in December because of equipment failure, but a Russian team is also at work now retrieving a core of water from Lake Vostok.

With much fanfare, the Lake Vostok core was pulled up last year from more than 2.5 miles (4 kilometers) below the frigid surface. Vostok is much deeper and larger than any other Antarctic lake, and both it and Ellsworth lie under much colder ice and are believed to have less deep subsurface water flowing in and out than does Whillans.

The existence of subglacial lakes and streams in Antarctica is a relatively new discovery, and the size of this wet world under the ice has only been grasped in recent years. (See Antarctic pictures by National Geographic readers.)

Helen Fricker, a glaciologist at the Scripps Institution of Oceanography and a principal investigator of the Whillans team, first described Lake Whillans in 2007.

Using satellite data, she and her colleagues discovered a periodic rising and falling of the ice surface above the Whillans Ice Stream between 2003 and 2006, and concluded that a lake was likely underneath.

The dynamics of Antarctic ice has taken on a much greater significance in the era of global warming, since some 90 percent of Earth's fresh water sits on the continent.

Although the lakes themselves are not affected by warming, how they interact with the region's ice is important to predicting the future behavior of the ice sheets.

For instance, understanding whether the ice is moving more quickly toward the surrounding ocean is a key goal of the WISSARD project, which is part of a larger U.S. National Science Foundation project to understand the ice movements, glaciers, and biology of the ice sheet of West Antarctica.

More Work to Be Done

For Christner, a specialist in Antarctic biology at Louisiana State University, the work has only just begun. (Also see "Pictures: 'Extreme' Antarctic Science Revealed.")

Two labs were brought to the Whillans site by a caravan of trucks from McMurdo: One to perform a quick analysis of the lake water, and the other to examine sediment.

Christner's team is charged with culturing samples in dishes so they can be studied more extensively later. He said some of the microbe species, including bacteria and archaea, may be unique, but many may well be found elsewhere—at great ocean depths and deep underground.

Read More..