Nasa

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The SpaceX Dragon commercial cargo craft is berthed on the Earth-facing side of the International Space Station's Harmony node on Wednesday, Oct. 10, 2012. (AP Photo/NASA)

A robot arm on the International Space Station captures the Dragon capsule as they pass over the South Atlantic Ocean early Wednesday, Oct. 10, 2012. It's the first official delivery by the California-based SpaceX company under a $1.6 billion contract with NASA. The contract calls for 12 such shipments. (AP Photo/NASA)

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The Soyuz TMA-04M spacecraft lands with Expedition 32 Commander Gennady Padalka of Russia, NASA Flight Engineer Joe Acaba and Russian Flight Engineer Sergie Revin in a remote area near Arkalyk, Kazakhstan, on Monday, Sept. 17, 2012. (AP Photo/NASA, Carla Cioffi)

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In this photo provided by NASA, members of the U.S. Navy ceremonial guard hold a United States flag over the remains of Apollo 11 astronaut Neil Armstrong during a burial at sea service aboard the USS Philippine Sea (CG 58), Friday, Sept. 14, 2012, on the Atlantic Ocean. Armstrong, the first man to walk on the moon during the 1969 Apollo 11 mission, died Aug. 25. He was 82. (AP Photo/NASA, Bill Ingalls)

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NASA Administrator Charles Bolden speaks during the memorial service for Neil Armstrong at the National Cathedral, Washington, D.C., Thursday, September 13, 2012. (Andrew Harnik/The Washington Times)

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Congressman Ralph hall (R-Texas), center, is greets by astronaut Capt. Eugene Cernan, center, right, as NASA Administrator Charles Bolden, center left, greets others before the memorial service for Neil Armstrong. (Andrew Harnik/The Washington Times)

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This handout image provided by NASA/JPL-Caltech/Univ. of Arizona, shows tracks from the first drives of NASA's Curiosity rover are visible in this image captured by the High-Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter. (AP Photo/NASA/JPL-Caltech/Univ. of Arizona)

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An undated artist rendering released by NASA shows the NASA Dawn spacecraft in orbit around the giant asteroid Vesta. After spending a year examining Vesta, Dawn is poised to depart and head to another asteroid, Ceres, where it will arrive in 2015. (AP Photo/NASA)

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Voyager 1 hurtles toward the outer limits of the solar system, 11 million miles from its launch pad, and still is sending information back to Earth. (NASA via Associated Press)

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This artists rendering provided by NASA shows the Voyager spacecraft. Launched in 1977, the twin spacecraft are exploring the edge of the solar system. (AP Photo/NASA)