Secretive space plane back in orbit: US Air Force

In a handout photo released by United Launch Alliance on May 20, 2015, an Atlas V rocket carrying the X-37B space plane launches the AFSPC-5 mission from Cape Canaveral Air Force StationThe US Air Force launched its robotic space plane into orbit for a fourth flight on Wednesday aboard an Atlas 5 rocket, in a mission aimed at testing a new engine to steer satellites, officials said. The rocket carrying the X-37B successfully lifted off from Cape Canaveral, Florida and officials said the scheduled return of the unmanned plane had yet to be determined. The X-37B will be testing a new orbital “thruster system” — which uses electricity and xenon — that could be employed to maneuver satellites in space, officials said.

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