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The Boeing X-37 Orbital Test Vehicle, an unmanned reusable spacecraft. The Boeing X-37, also known as the X-37 Orbital Test Vehicle (OTV), is an American reusable unmanned spacecraft. It is boosted into space by a rocket, then re-enters Earth's atmosphere and lands as a spaceplane. The X-37 is operated by the United States Air Force for orbital spaceflight missions intended to demonstrate reusable space technologies. It is a 120%-scaled derivative of the earlier Boeing X-40. As of 2013 it holds the world record for being the smallest robotic, unmanned space plane. (Photo by Reuters/NASA)
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