With White House approval secured, NASA is set to unveil a long-awaited human space exploration roadmap that calls for landing four astronauts on the Moon by 2018.

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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...