Noobink: The X-37B Orbital Space Vehicle, one-fourth the size of the Endeavour Space Shuttle, has just completed 500 days in space - but we still don't know its mission.

The X-37B Orbital Space Vehicle, one-fourth the size of the Endeavour Space Shuttle, has just completed 500 days in space - but we still don't know its mission.

http://phys.org/news/2014-04-mysterious-robotic-plane-days-space.html

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