More than $1 billion worth of human and robotic technology projects selected for funding late last year by NASA’s Exploration Systems mission directorate are on the chopping block as the U.S. space agency re-evaluates its technology investment strategy.

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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...