Nasa

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This Wednesday Feb. 19, 2014 photo released by NASA shows a test version of the Orion spacecraft, tethered inside the well deck of the USS San Diego prior to testing between NASA and the U.S. Navy. NASA and the Navy suspended the test Thursday, Feb. 20, 2014 off the coast of San Diego after a problem was discovered. (AP Photo/NASA)

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This Wednesday, Feb. 19, 2014 photo released by NASA shows crews testing a test version of Orion's forward bay cover, NASA's next-generation space capsule. NASA and the Navy suspended the test Thursday, Feb. 20, 2014 off the coast of San Diego after a problem was discovered. (AP Photo/NASA)

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In this photo provided by NASA, the Cygnus supply ship is released from the International Space Station, Tuesday, Feb. 18, 2014. Cygnus is filled with garbage and will burn up when it plunges through the atmosphere Wednesday. Orbital Sciences Corp. launched the capsule last month from Virginia under a $1.9 billion contract with NASA. The Cygnus delivered 3,000 pounds of goods, including belated Christmas gifts for the six-man crew and hundreds of ants for a student experiment. (AP Photo/NASA)

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FILE - This composite image provided by NASA shows before and-after images taken by the Opportunity rover. At left is an image of a patch of ground taken on Dec. 26, 2013. At right is in image taken on Jan. 8, 2014 showing a rock shaped like a jelly doughnut that had not been there before. Researchers have determined this now-infamous Martian rock resembling a jelly doughnut, dubbed Pinnacle Island, is a piece of a larger rock broken and moved by the wheel of NASA's Mars Exploration Rover Opportunity in early January. Opportunity landed on Mars in 2004 and continues to explore. (AP Photo/NASA)

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This Feb. 8, 2014 photo, provided by NASA, shows the site of the 2014 Winter Olympics at night, in Sochi, Russia. Fisht Stadium where the opening ceremony was held on Friday, Feb. 7, 2014, is the bright circular structure. (AP Photo/NASA)

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National Edition News cover for January 31, 2014 - Earth to senator: NASA wasting time, money on your pet project: The A-3 Test Stand under construction is the first large test structure built at Stennis since the 1960s. Photo date: Mar. 02, 2012

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In an image made from NASA TV broadcast flight engineer Sergey Ryazanskiy completes installation of the high-resolution camera on the Insternational Space Station Monday Jan. 27, 2014. Ryazanskiy and commander Oleg Kotov ventured outside the International Space Station to install a pair of commercially provided cameras. (AP Photo/NASA)

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In an image made from NASA TV, the helmet camera of flight engineer Sergey Ryazanskiy shows commander Oleg Kotov Monday Jan. 27, 2014, as they install a high-resolution camera outside the International Space Station. Ryaazansky's gloved hand is at lower left. Kotov and Ryazanskiy made the spacewalk to install a pair of commercially provided cameras. (AP Photo/NASA)