Oct. 15 (Bloomberg) -- After nearly two years in orbit, the Air Force's mysterious X-37B space plane is reportedly returning to Earth. There are many theorie...
Secret Missions of the X-37B
X-37B Orbital Test Vehicle-3 Lands at Vandenberg AFB
X-37 ALTV Test Flight (2010)
Launch of X-37B Mini Space Shuttle on OTV-3 Mission
X-37B: Secret space plane
What Was The Military's Secret Shuttle Doing In Space?