Mystery Mission: Air Force's X-37B Space Plane Nears 1 Year in Orbit

Tuesday, May 10, 2016 - 08:01 in Astronomy & Space

The robotic space plane launched atop a United Launch Alliance Atlas V rocket on May 20, 2015, kicking off the X-37B program's fourth flight. This mission, dubbed OTV-4 (short for Orbital Test Vehicle-4), remains a clandestine affair.

Read the whole article on Space.com

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