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US Air Force’s Secretive X-37B Space Plane Nears Day 500 in Orbit

The U.S. Air Force’s mysterious robotic X-37B space plane is sailing toward the 500-day mark in Earth orbit on a secret military mission. The X-37B space plane launched on Dec. 11, 2012, and is out the Orbital Test Vehicle 3 (OTV-3) mystery mission.

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US Air Force’s Secretive X-37B Space Plane Nears Day 500 in Orbit