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A computer-generated image of a EADS Atrium aircraft which will enable space tourists to experience weightlessness in 2012 Ho New/Reuters

Argentine NASA team member tests space suit designed for Mars in Antarctica Ho New/REUTERS

Robonaut 2 is shown in the International Space Station's Destiny laboratory during a round of testing NASA/Reuters

Volker Maiwald, left, executive officer and habitat engineer and Hans van Ôt Woud, a mapping researcher and the health and safety officer of Crew 125 EuroMoonMars B mission, return to the habitat in their simulated space suits at the Mars Desert Research Jim Urquhart/REUTERS

A SpaceX upgraded Falcon 9 rocket undergoes launch preparations at Vandenberg Air Force Base in California Gene Blevins/REUTERS

Handout of technicians working on the heat shield of NASA's Orion space capsule at Kennedy Space Center in Florida NASA/Reuters

NASA handout shows a prototype of a free-flying space robot equipped with a smartphone, known as Smart SPHERES (Synchronized Position Hold, Engage, Reorient Experimental Satellites) NASA/Reuters

Virgin Galactic's WhiteKnightTwo carrier aircraft mothership, which landed safely after splitting from SpaceShipTwo, is seen in a hangar at Mojave Air and Space Port in Mojave Lucy Nicholson/REUTERS

A BEAM module is displayed during a media briefing in Las Vegas NASA/Reuters

People take pictures as the SLS five-segment Solid Rocket Motor undergoes a static test fire at the Orbital ATK facility in Promontory Jim Urquhart/REUTERS

Physicist Schildhammer wears Aouda.X spacesuit simulator during field test inside giant ice cave at Dachstein mountain Lisi Niesner/REUTERS

NASA artist's rendering of an X-37 orbital test vehicle NASA/Handout

An undated U.S. Air Force handout graphic depicts the X-51A Waverider in flight Handout/Reuters

Sunshield for NASA's James Webb Space Telescope expanded at Northrop Grumman facility in Redondo Beach NASA/Reuters

An artist's concept of NASA's Mars Science Laboratory spacecraft approaching Mars Handout/REUTERS

NASA?s Space Launch System 70-metric-ton configuration is seen launching to space in this undated artist's rendering NASA/Reuters

The unmanned SpaceX Crew Dragon lifts off from launch pad 40 during a Pad Abort Test at the Cape Canaveral Air Force Station in Cape Canaveral Scott Audette/REUTERS

An undated artist's concept shows the test vehicle for NASA's Low-Density Supersonic Decelerator NASA/REUTERS

NASA handout shows the Sierra Nevada Corporation Dream Chaser flight vehicle being readied for 60 mph tow tests at NASA's Dryden Flight Research Center in Edwards NASA/Reuters

Epp, Johnson Space Center Project Manager for ALHAT, shows the media the Morpheus prototype lander in Cape Canaveral, NASA/REUTERS

NASA astronauts Cady Coleman and Ricky Arnold step into the Orion crew module hatch during a series of spacesuit check tests conducted at the Space Vehicle Mockup Facility at the agency's Johnson Space Center in Houston NASA/REUTERS

An artist's concept of NASA's Lunar Atmosphere and Dust Environment Explorer (LADEE) spacecraft seen orbiting near the surface of the moon NASA/Reuters

Cassini spacecraft makes a close pass by Saturn's moon Enceladus in an artist's rendering image NASA/REUTERS

A NASA picture shows a 1.79 percent scale model of a future concept supersonic aircraft NASA/REUTERS

NASA's new Earth-bound rover in Summit Camp the highest spot in Greenland NASA/REUTERS