WASHINGTON — The July 26 test stand accident that killed three Scaled Composites employees on a propulsion system for Virgin Galactic’sSpaceShipTwo is expected to be no more than a temporary setback for the emerging personal spaceflight industry.

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Brian Berger is editor in chief of SpaceNews.com and the SpaceNews magazine. He joined SpaceNews.com in 1998, spending his first decade with the publication covering NASA. He was named senior staff writer in 2004, a position he held until being named...