Air Force uses its secretive space drone to test futuristic propulsion system

Ask someone in the street what they know about the Air Force's top-secret space plane and you'll probably wind up getting pinched by the NSA. Nobody can claim to know much about the X-37B, beyond the fact that it's the force's long-term space vehicle...

via Engadget RSS Feed http://www.engadget.com/2015/04/28/x-37b-hall-thruster-test/?ncid=rss_truncated