People take pictures as the SLS five-segment Solid Rocket Motor undergoes a static test fire at the Orbital ATK facility in Promontory, Utah March 11, 2015. A beefed-up space shuttle solid rocket motor passed a two-minute test firing in Utah on Wednesday, a key milestone toward the debut flight of NASA's deep-space launcher in 2018, the U.S. space agency said. REUTERS/Jim Urquhart (UNITED STATES - Tags: SCIENCE TECHNOLOGY) 

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, California November 4, 2014. The passenger spacecraft dubbed SpaceShipTwo broke into pieces over California's Mojave Desert on October 31 and crashed shortly on, near the port, north of Los Angeles. SpaceShipTwo, developed by the fledgling space tourism company of billionaire entrepreneur Richard Branson, was designed to carry wealthy passengers on short rides into space. REUTERS/Lucy Nicholson (UNITED STATES - Tags: DISASTER TRANSPORT BUSINESS TPX IMAGES OF THE DAY) 

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, Florida May 6, 2015. REUTERS/Scott Audette TPX IMAGES OF THE DAY

A SpaceX upgraded Falcon 9 rocket undergoes launch preparations at Vandenberg Air Force Base in California September 27, 2013. Privately owned Space Exploration Technologies plans to test an upgraded Falcon 9 rocket on Sunday from a site in California as part of its push into the satellite launch market. Perched on top of the 22-story, beefed-up Falcon 9 will be Canada’s Cassiope science satellite. Liftoff is targeted for 9 a.m. PDT (1600 GMT).
“This is essentially a development flight for the rocket,” company founder and chief executive Elon Musk told Reuters. REUTERS/Gene Blevins (UNITED STATES - Tags: SCIENCE TECHNOLOGY BUSINESS) 

Volker Maiwald (L), executive officer and habitat engineer and Hans van 't Woud, a mapping researcher and the health and safety officer of Crew 125 EuroMoonMars B mission, return to the Mars Desert Research Station (MDRS) outside Hanksville in the Utah desert, March 3, 2013. The MDRS aims to investigate the feasibility of a human exploration of Mars and uses the Utah desert's Mars-like terrain to simulate working conditions on the red planet. Scientists, students and enthusiasts work together developing field tactics and studying the terrain. All outdoor exploration is done wearing spacesuits and carrying air supply packs and crews live together in a small communication base with limited amounts of electricity, food, oxygen and water. Everything needed to survive must be produced, fixed and replaced on site. REUTERS/Jim Urquhart (UNITED STATES - Tags: SCIENCE TECHNOLOGY SOCIETY ENVIRONMENT) 

Physicist Daniel Schildhammer wears the Aouda.X spacesuit simulator during a field test of Oesterreichisches Weltraum Forum (Austrian space forum) inside the Eisriesenhoehle (giant ice cave) at Dachstein mountain near the village of Obertraun April 28, 2012. The Aouda.X is a spacesuit simulator for manned missions to Mars, which is being developed under the Mars Analog Research Program PolAres and allows to simulate environmental conditions, a real space suit would be faced on Mars. REUTERS/Lisi Niesner (AUSTRIA - Tags: SCIENCE TECHNOLOGY TPX IMAGES OF THE DAY)