Secret Air Force space plane preparing for return to Earth.

The X37B is a spacecraft measuring 8 meters high, equipped with a front kerosene fuel tank, an experiment bay, and a larger hydrogen peroxide tank. It can operate at altitudes between 125 and 570.5 miles above Earth. The X37B has exceeded its designed maximum duration of 270 days in orbit by six months. It is expected to return to Vandenberg Air Force Base shortly.

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