Boeing XS-1 Experimental Spaceplane artist concept

For the second consecutive year, the Defense Advanced Research Projects Agency’s top-funded space program is an experimental spaceplane that could fly 10 times in 10 days.

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Mike Gruss is the chief content and strategy officer at SpaceNews. From 2013 to 2016 he was a senior reporter at SpaceNews covering military space. Previously, he was editor in chief of Sightline Media Group and worked as a reporter and columnist for...