Investigators are certain that the Virgin Galactic spacecraft that suffered a problem during a test flight and crashed Friday broke up in mid-air, but a complete analysis could take 12 months, the National Transportation Safety Board said Saturday night. There are many things that investigators dont yet know: What caused SpaceShipTwo to break apart Friday; why one pilot was able to deploy a parachute and the other was not; and whether that surviving pilot bailed out of the rocket plane or was ejected by some other force.
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