The mission of the drone X-37B is classified. This drone was designed by the US Air Force and launched into space by NASA. It has been more than two years in space to do several tests.
Only the test of a new propeller and that of the obsevation of the evolution of certain materials in space have been revealed to the public.
Fans of satellites have been able to observe the movements of the drone in space and have noted that a satellite had never moved so far.
This drone looks like a shuttle and is put into orbit conventionally on an Atlas 5 rocket.
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