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Thursday marked an exciting milestone for Virgin Galactic. For the first time, a spaceship built by The Spaceship Company, and operated by its parent company, Virgin Galactic, has taken to the skies. SpaceShipTwo doesn’t launch from a pad on the ground, but rather from under the wing of a carrier aircraft, WhiteKnightTwo. Thursday's flight test was what is called a ‘captive carry’ flight, during which VSS Unity remained mated to the WhiteKnightTwo mothership for the entire flight from takeoff to landing. After a year of work by her family and an act of Congress sponsored by Arizona Republican Representative Martha McSally, the cremains of