The U.S. Air Force’s X-37B space plane has now been circling Earth for more than 600 days on its latest mystery mission. Exactly what it’s doing up there is unclear.
The reusable robotic vehicle, which looks like a miniature version of NASA’s space shuttle orbiters, launched atop a SpaceX Falcon 9 rocket from NASA’s Kennedy Space Center in Florida on Sept. 7, 2017.
https://www.space.com/x-37b-military-space-plane-otv5-600-days.html
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