LOS ANGELES — Virgin Galactic says a series of final confirmation hot-fire tests of SpaceShipTwo’s RM2 hybrid rocket are under way at Mojave, Calif., in preparation for the start of powered test flights of its suborbital passenger vehicle. The first of the rapid-fire rocket tests took place on Feb. 28 and was deemed a success, Virgin founder Richard Branson says. Despite the challenges and “at times, agonizing process to get the space program this far,” Branson says in a recent blog ...


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