The United States Air Force's X-37B robotic space plane is scheduled to launch on its fourth mission this Wednesday (May 20). Just what it will be doing, and for how long, is a mystery.
What Will the X-37B Military Space Plane Do on Its Next Mystery Mission?
SPACE.com - 19 May 2015 13:46
The United States Air Force's X-37B robotic space plane is scheduled to launch on its fourth mission this Wednesday (May 20). Just what it will be doing, and for how long, is a mystery.
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