Space Plane
A Top Secret Air Force Space Drone Has Been Orbiting Earth for Almost 2 Years
The Pentagon's experimental unmanned space plane, the X-37B, just broke a record after orbiting the planet for 719 days straight. But what's it doing up there?
X37-B, the Military's Secretive Space Drone, Is Going Back Into Orbit
The space plane will be used to test ion propulsion, among many other classified missions.
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