WASHINGTON — NASA science chief Alan Stern, is vowing to wring more science out of the U.S. space agency’s tight budget by getting better upfront cost estimates, holding managers more accountable, canceling projects that are not performing, ending missions that have outlived their usefulness, and collaborating more with other space agencies.

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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. His reporting on the 2003 Space Shuttle Columbia accident was recognized with...