U.S. Senate appropriators are attempting to breath new life into one of two deep-space mission proposals that were passed over in the most recent competition under NASA’s Discovery-series of cost-capped planetary probes.

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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...