NASA’s latest setback on the road to completing the international space station comes as the U.S. space agency prepares to roll out its plan for replacing the space shuttle fleet with the new vehicles that will be needed to carry astronauts and equipment to the Moon.

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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...