Mystery Military Space Plane Lands After Two-Year Mission

  • 7 years ago
by Jeff DonlanA military space plane just returned from another mysterious mission. The U.S. Air Force’s X-37B landed with a sonic boom this weekend, after a classified space mission lasting nearly two years. Most of the X-37B’s activities are kept secret, but the Air Force says they are just testing technologies in orbit. This mission reportedly involved testing a new thruster system and NASA material samples. This was X-37B’s fourth mission. It first flew in 2010.​ 
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