The has kept a tight lid on details about the that is perpetually flying 500 miles above Earth's surface.
But the Department of Defense (DoD) has released a rare video showing the Boeing-built performing a 'groundbreaking' maneuver to reach a new level of orbit using a first-of-its-kind 'aerobraking' procedure.
The video shows how the $200 million craft point its flat underside forward, using friction from Earth's atmosphere to slow down, treating it like a brake, while directing the nose of the aircraft away from earth.
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