Technicians in self-contained atmospheric protective ensemble suits conduct initial checks on the X-37B Orbital Test Vehicle 1 after its landing Dec. 3, 2010, at Vandenberg Air Force Base, Calif. The X-37B conducted on-orbit experiments for more than 220 days during its maiden voyage. (U.S. Air Force photo/Michael Stonecypher) (Photo by DoD/Corbis via Getty Images)图:inews.co.uk