Virigin Galactic’s SpaceShipTwo rocket plane exploded and crashed during a test flight on Friday, killing one crew member and seriously injuring another, authorities said.The explosion scattered debris across a two-mile swath of the desert floor outside Mojave, California, and came after the plane was released from its WhiteKnightTwo carrier airplane. SpaceShipTwo was testing its rocket engine in flight for the first time in more than nine months....
