NASA is undertaking a broad reorganization of its Exploration Systems Mission Directorate (ESMD), which was created in 2004 to oversee development of the hardware the U.S. space agency will need to send humans to the Moon by 2020.

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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...