NASA Administrator Mike Griffin’s pledge to put a Europa orbiter mission back on the table has drawn praise from scientists and planetary exploration advocates, even if some are wondering where such an undertaking will fit in the U.S. space agency’s list of priorities.

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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...