Nasa

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FILE - This May 23, 2011 photo released by NASA shows the International Space Station at an altitude of approximately 220 miles above the Earth, taken by Expedition 27 crew member Paolo Nespoli from the Soyuz TMA-20 following its undocking. A computer outage at the International Space Station may require a spacewalk by astronauts and threatens to delay next week's launch of a commercial supply ship for NASA. NASA said Friday night April 11, 2014 that a backup computer on the outside of the orbiting lab is not responding to commands. (AP Photo/NASA, Paolo Nespoli)

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This undated photo provided by Bonhams auction house on April 4, 2014 shows a space suit from NASA's Mercury era. The suit was never worn by an astronaut on an actual space mission but will be among the artifacts of space history that will be offered at auction by Bonhams in New York on Tuesday, April 8, 2014. (AP Photo/Bonhams)

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President Barack Obama is given an "I'm an Obamanaut" bumper sticker at NASA operations at the Kennedy Space Center in Cape Canaveral, Fla., April 15, 2010. (Official White House Photo by Pete Souza)

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A photo of the Mars landscape provided by NASA appears to include artificial light shining in the distance. (NASA)

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FILE - This Tuesday, March 26, 2013 file photo provided by NASA shows the release of the SpaceX Dragon-2 spacecraft from the International Space Station. A delayed supply run to the International Space Station is now set to launch April 14, 2014. The private company SpaceX will be making its fourth trip to the space station from Cape Canaveral, Fla. The launch was postponed twice in March, the last time because of an electrical short on Air Force ground equipment. NASA announced the new launch date on Friday, April 4, 2014. The moon is at background center. (AP Photo/NASA)