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Virgin Galactic cracks sound barrier
British billionaire Richard Branson's Virgin Galactic got one step closer to carrying tourists to space when a test pilot cracked the sound barrier over the Mojave Desert. For the first time, the company's SpaceShipTwo sped to Mach 1.2 and reached 56,000 feet in altitude.
Read more: Virgin Galactic goes supersonic in rocket test
April 29, 2013