Updated 4:59 PM EDT, Fri, Oct 11, 2019

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Clandestine X-37B Spaceplane Finally Returns to Earth after Record 718 Days in Orbit

The X-37B is a sophisticated spy spaceplane that's been equipped with high-resolution cameras on all its four missions.

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U.S. Air Force’s Top Secret X-37B Spaceplane Breaks Space Endurance Record

The X-37B is testing a prototype "Hall Effect Thruster" (HET).

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