Mysterious Air Force X-37B 'Space Plane' Set For Launch

May 20, 2015 10:35 AM

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The U.S. Air Force is set to launch its secretive "space plane" on Wednesday, the fourth flight of the mysterious unmanned X-37B Orbital Test Vehicle.

Unlike previous missions, however, the Air Force has offered details of at least part of its mission: an experimental Hall thruster. This electric propulsion device ionizes a noble gas such as xenon. The device would allow a spacecraft to carry larger payloads and perform more orbital maneuvers than...

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