Nasa

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National Aeronautics and Space Administration Administrator (NASA) Charles Bolden lays a wreath at a Challenger memorial, at Arlington National Cemetery, in Arlington, Va., Thursday, Jan. 27, 2011, in commemoration of NASA's National Day of Remembrance. (AP Photo/Manuel Balce Ceneta)

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These handout images, provided by NASA, taken by the Hubble Space Telescope shows the sky in the region of the Hubble Ultra-Deep field taken with the new Wide Field Camera 3 Infra-red imager (WFC3/IR) on HST. This image is the deepest image of the sky ever obtained in the near-infrared, left. Right is the image enhanced showing the galaxy that existed 480 million years after the Big Bang and the position in the Hubble Ultra Deep Field (HUDF) where it was found. (AP Photo/NASA)

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FILE - This 1986 file photo provided by NASA shows the crew of the space shuttle Challenger. From left are Ellison Onizuka, Mike Smith, Christa McAuliffe, Dick Scobee, Greg Jarvis, Ron McNair and Judith Resnik. (AP Photo/NASA)

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This photo provided by ABC television shows Rep. Gabrielle Giffords' husband and NASA astronaut Capt. Mark Kelly talks with host Diane Sawyer during a pretaped interview in Tucson, Saturday, Jan. 15, 2011, his first television interview since the tragic shooting of his wife in Tucson. The interview is scheduled to air Tuesday, Jan. 18. (AP Photo/ABC News, Ralph Freso) NO ARCHIVES. NO SALES.

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**FILE** Rep. Gabrielle Giffords, Arizona Democrat, is shown with her husband, Navy Capt. Mark Kelly, who is a NASA astronaut. (Associated Press/Office of Rep. Gabrielle Giffords)

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In a photo provided by NASA the Washington Monument is seen as the full moon is shadowed by the Earth during a total lunar eclipse on the arrival of the winter solstice, Tuesday, December 21, 2010 in Washington. From beginning to end, the eclipse lasted about three hours and twenty-eight minutes. (AP Photo/NASA/Bill Ingalls)

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A photo provided by NASA shows the total lunar eclipse as the full moon is shadowed by the Earth on the arrival of the winter solstice, Tuesday, Dec. 21, 2010 in Arlington, VA. From beginning to end, the eclipse will last about three hours and twenty-eight minutes. (AP Photo/NASA/Bill Ingalls)

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This image provided by NASA shows the Soyuz TMA-20 spacecraft shortly after arrival to the launch pad Monday, Dec. 13, 2010, at the Baikonur Cosmodrome in Kazakhstan. NASA astronaut Catherine Coleman, Russian cosmonaut Dmitry Kondratyev and Paolo Nespoli of the European Space Agency are set to launch in the Soyuz to the International Space Station on Wednesday, Dec. 15, 2010, at 2:09 p.m. EST. (AP Photo/NASA - Carla Cioffi)

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FILE - This undated file artist's rendering shows one of NASA's twin Voyager spacecraft. NASA says the long-running Voyager 1 spacecraft hurtling toward the edge of the solar system has reached another milestone. Since 2004, the unmanned probe has been exploring a region of space where the solar wind slows abruptly and crashes into the thin gas between stars. NASA said Monday that recent readings show the solar wind has slowed to zero, meaning the spacecraft is getting ever closer to the solar system's edge. (AP Photo/NASA, File)

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This image provided by NASA, taken Oct. 6, 2004, by the Cassini Saturn Probe, shows the planet Saturn and its rings. One of the most evocative mysteries of the solar system, where Saturn got its stunning rings, may actually be a case of cosmic murder with an unnamed moon of Saturn, that disappeared about 4.5 billion years ago, as the potential victim. Suspicion has fallen on a disk of hydrogen gas, that surrounded Saturn when its dozens of moons were forming, but has now fled the scene. And the cause of death? A possible forced plunge into Saturn. (AP Photo/NASA)

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FILE - This May 23, 2010 file photo provided by NASA shows the International Space Station photographed by an STS-132 crew member on space shuttle Atlantis after the station and shuttle began their post-undocking relative separation. NASA's effort to farm out astronaut trips to the International Space Station to private companies over the next decade is under fire again, this time by federal deficit hit men. (AP Photo/NASA, File)

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This image provided by NASA shows a Nov. 4, 2010 image from NASA's EPOXI mission spacecraft showing part of the nucleus of comet Hartley 2. The sun is illuminating the nucleus from the right. A distinct cloud of individual particles is visible. Scientists say a NASA spacecraft braved a cosmic ice storm during this recent flight past the comet Hartley 2.(AP Photo/NASA)

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This composite image provided by NASA, created this month, taken by NASA's Chandra X-ray Observatory and other telescopes, shows a galaxy where a recent supernova probably resulted in a black hole in the bright white dot near the bottom middle of the picture. (AP Photo/NASA)

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FILE - In this April 8, 2010 file picture, NASA astronaut Michael Barratt, STS-133 mission specialist, shakes hands with Robonaut 2 during a news conference in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center in Houston. Ron Diftler, NASA Robonaut project manager, is at left. Astronaut Catherine Coleman said Friday, March 4, 2011 that she and the 11 other humans aboard the shuttle-station complex want to get R2 out of its packing material as soon as possible. (AP Photo/NASA, Lauren Harnett)

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In this March 3, 2011 photo provided by NASA, astronauts Eric Boe, left, and Scott Kelly move the crate containing Robonaut 2, better known as R2, the first humanoid robot in space, at the International Space Station. The 220-mile-high (354-kilometer-high) unveiling of R2, the first humanoid robot in space, is being moved up at the urging of the president of the United States. Astronaut Catherine Coleman said Friday, March 4, 2011 that she and the 11 other humans aboard the shuttle-station complex want to get R2 out of its packing material as soon as possible. R2, flew to the International Space Station aboard Discovery and will stay behind when the shuttle leaves Monday. (AP Photo/ESA/NASA)

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NASA Administrator Charles Bolden speaks to employees and guests prior to announcing the final destinations of the three remaining space shuttles at the Kennedy Space Center in Cape Canaveral, Fla., Tuesday, April 12, 2011.(AP Photo/John Raoux)

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NASA workers walk along a platform on the service structure next to space Shuttle Discovery on Pad 39A at the Kennedy Space Center in Cape Canaveral, Fla. Discovery's final launch was delayed until Thursday. (Associated Press)

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Expedition 24 Flight Engineer Tracy Caldwell Dyson, left, Commander Alexander Skvortsov, center and Mikhail Kornienko sit in chairs outside the Soyuz Capsule just minutes after they landed near the town of Arkalyk, Kazakhstan on Saturday, Sept. 25, 2010. Russian Cosmonauts Skvortsov and Kornienko and NASA Astronaut Caldwell Dyson, are returning from six months onboard the International Space Station. (AP Photo/NASA - Bill Ingalls)

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This image provided by NASA shows the eye of Hurricane Igor taken from the International Space Station Tuesday Sept.14, 2010, by astronaut Douglas Wheelock. At midnight Sept. 15, 2010, Igor was about 1140 miles southeast of Bermuda with maximum sustained winds of 155 mph moving to the west-northwest at 9 mph. (AP Photo/NASA - Doug Wheelock)

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This image provided by the National Aeronautics and Space Administration shows Hurricane Earl at 12:45 a.m. EDT on Thursday, Sept. 2, 2010. As of Wednesday night, Earl was a powerful Category 4 hurricane centered more than 520 miles south-southeast of Cape Hatteras, N.C., with winds of 140 mph. (AP Photo/NASA)