By Mike Wall
Space.com
5-17-15
The United States Air Force's mysterious X-37B space plane will head to orbit this week for the fourth time.
The unmanned X-37B spacecraft is scheduled to launch Wednesday (May 20) at 10:45 a.m. EDT (1445 GMT) atop a United Launch Alliance Atlas V rocket from Florida's Cape Canaveral Air Force Station. The liftoff will begin the reusable space plane's fourth mission, which is known as OTV-4 (short for Orbital Test Vehicle-4).
Most of the X-37B's payloads and specific activities are classified, so it's not entirely clear what the space plane will be doing once it leaves Earth Wednesday. This secrecy has led to some speculation that the vehicle might be some sort of space weapon . . ..
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See Also:
Mysterious X-37B Military Space Plane to Fly Again
Air Force's Secret X-37B Space Plane Breaks Orbit Record
Secret X-37B Space Plane Passes 600 Days in Orbit | VIDEO
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