Secret Robot Space Plane Returns To Earth Today

x-37B Upright
U.S. Air Force

In 2012, the Air Force sent an unmanned robot plane into space. It is scheduled to return today, completing its third voyage into space, one that began way back in the simpler days of 2012. The X-37B (not to be confused with the U.S. Navy’s terrestrial experimental unmanned X-47B airplane) is a known space plane with a secret purpose.

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