Virgin Galactic has begun glide flights of the second, and significantly improved, SpaceShipTwo (SS2) suborbital vehicle three days after completing a fourth and final captive-carriage flight under the WhiteKnightTwo mothership. Flying on Dec. 3 from Virgin’s test site at Mojave, California, the spaceplane and its carrier aircraft took off at around 6:50 a.m. Pacific time. After climbing over the Owens Valley area to a release altitude of 50,000 ft., the spaceplane ...


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