Nasa

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This image provided by NASA was photographed by the spacecraft Messenger, the first ever images made from a spacecraft while in orbit around the planet. It shows Mercury's horizon as the spacecraft was moving northward along the first orbit during which MDIS was turned on. On March 17, 2011 Messenger became the first spacecraft to orbit the planet Mercury. (AP Photo/NASA)

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Illustration: NASA

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In this image provided by NASA the space shuttle Discovery is seen from the International Space Station as the two orbital spacecraft accomplish their relative separation on March 7, 2011 after an aggregate of 12 astronauts and cosmonauts worked together for over a week. The area below is the southwestern coast of Morocco in the northern Atlantic. During a post undocking fly-around, the crew members aboard the two spacecraft collected a series of photos of each other's vehicle. Discovery ended its nearly 27-year flying career when it landed Wednesday. (AP Photo/NASA)

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In this image provided by NASA the space shuttle Discovery is seen from the International Space Station as the two orbital spacecraft accomplish their relative separation on March 7, 2011 after an aggregate of 12 astronauts and cosmonauts worked together for over a week. The area below is the southwestern coast of Morocco in the northern Atlantic. During a post undocking fly-around, the crew members aboard the two spacecraft collected a series of photos of each other's vehicle. Discovery ended its nearly 27-year flying career when it landed Wednesday. (AP Photo/NASA)

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In this image provided by NASA the space shuttle Discovery is seen from the International Space Station as the two orbital spacecraft accomplish their relative separation on March 7, 2011, after an aggregate of 12 astronauts and cosmonauts worked together for over a week. During a post undocking fly-around, the crew members aboard the two spacecraft collected a series of photos of each other's vehicle. Discovery ended its nearly 27-year flying career when it landed Wednesday. (AP Photo/NASA)

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In this image provided by NASA the International Space Station is seen from Discovery backdropped against clouds over Earth, as the two orbital spacecraft accomplish their relative separation on March 7, 2011, after an aggregate of 12 astronauts and cosmonauts worked together for over a week. During a post undocking fly-around, the crew members aboard the two spacecraft collected a series of photos of each other's vehicle. Discovery ended its nearly 27-year flying career when it landed Wednesday. (AP Photo/NASA)

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This image provided by NASA and photographed Sunday March 6, 2011, by an Expedition 26 crew member on the International Space Station shows Earth's thin line of atmosphere and a gibbous moon. (AP Photo/NASA)

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Inside the U.S. space lab Destiny, 12 astronauts and cosmonauts take a break from a very busy week aboard the International Space Station to pose for a joint STS-133 (space shuttle Discovery)/Expedition 26 (ISS) group portrait on Thursday, March 3, 2010. The STS-133 crew members, attired in red shirts, are (from left) NASA astronauts Nicole Stott, Alvin Drew, Eric Boe, Steve Lindsay, Michael Barratt and Steve Bowen. The dark-blue-attired Expedition 26 crew members (from left) are European Space Agency astronaut Paolo Nespoli; Russian cosmonauts Oleg Skripochka, Dmitry Kondratyev (below) and Alexander Y. Kaleri; and NASA astronauts Scott Kelly and Cady Coleman (below). (AP Photo/NASA)

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In this 59-second time exposure photo released by Anthony Galvan III, the Taurus XL rocket carrying NASA's Glory satellite launches from Vandenberg Air Force Base in Goleta, Calif., early Friday, March 4, 2011. NASA says in a statement that a protective shell atop the rocket did not separate from the satellite as it should have about three minutes after the launch. The rocket failed to reach orbit. (AP Photo/Anthony Galvan III) NO SALES

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In this image taken from video released by NASA, all twelve Discovery and International Space Station crew members wave during a call from President Barack Obama Thursday, March 3, 2011. From top left, Nicole Stott, Paolo Nespoli, Oleg Skripochka, Alexander Kaleri, Dmitry Kondratyev, commander Scott Kelly, Catherine Coleman, and Steve Bowen; from bottom left, Alvin Drew, pilot Eric Boe, commander Steve Lindsey, and Michael Barratt. (AP Photo/NASA)

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The Taurus XL rocket that blasted off carrying NASA's Glory satellite from Vandenberg Air Force Base early Friday March 4, 2011, failed to reach orbit. NASA says in a statement that a protective shell atop the rocket did not separate from the satellite as it should have about three minutes after the launch. (AP Photo/Bryan Walton - Santa Maria Times)

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This image provided by NASA shows the encapsulated Glory spacecraft sitting atop the Taurus XL rocket and awaiting launch on the pad at Vandenberg Air Force Base's Space Launch Complex in Calif., Feb. 22, 2011. Vandenberg Air Force Base officials sid the Taurus XL rocket carrying NASA's Glory satellite lifted off about 2:10 a.m. PST Friday, March 4, 2011, from the base. However the fairing surrounding the Glory spacecraft failed to separate properly preventing the spacecraft from reaching orbit. (AP Photo/NASA)

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In a photo provided by NASA, the space shuttle Discovery is seen shortly after the Rotating Service Structure was rolled back at launch pad 39A, at the Kennedy Space Center in Cape Canaveral, Florida, on Wednesday, Feb. 23, 2011. Discovery, on its 39th and final flight, will carry the Italian-built Permanent Multipurpose Module (PMM), Express Logistics Carrier 4 (ELC4) and Robonaut 2, the first humanoid robot in space to the International Space Station. (AP Photo/NASA/Bill Ingalls)

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NASA crews prepare Space Shuttle Discovery for its scheduled launch on Thursday for an 11-day trip to the International Space Station — its 39th mission. No other craft has flown in space as much. (Associated Press)

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This photo released by NASA/JPL on Feb. 15, 2011 shows an image from NASA's Stardust mission of comet Tempel 1 taken on Feb. 14, 2011. The Stardust craft zipped past a comet half the size of Manhattan during a Valentine's Day rendezvous that scientists hoped would shed light on these icy solar system bodies. At nearest approach, the craft passed within 112 miles of the potato-shaped comet, closer than the original prediction. (AP Photo/ NASA/JPL/ Caltech/Cornell)

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Capt. Mark E. Kelly, husband of wounded Rep. Gabrielle Giffords, will be aboard Endeavour for its final flight in April, NASA confirmed Friday Jan. 4, 2011. (AP Photo/NASA, File)

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This artist rendering provided by NASA shows Kepler-11, a sun-like star around which six planets orbit. A planet-hunting telescope is finding whole new worlds of possibilities in the search for alien life, including more than 50 potential planets that initially appear to be in habitable zones. (Associated Press/NASA)

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This image provided by NASA shows Tropical Cyclone Yasi as it approaches Queensland, Australia, Wednesday Feb. 2, 2011. (AP Photo/NASA - Jeff Schmaltz)

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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., on Thursday, Jan. 27, 2011, in commemoration of NASA's National Day of Remembrance. (AP Photo/Manuel Balce Ceneta)

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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) ** FILE **