NASA Administrator Mike Griffin is shifting the planning for future exploration missions into high gear with the intention of making fundamental decisions this summer about the United States’ path back 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...