AJ-26 rocket engine being test fired.

An AJ-26 engine slated to power the Antares rocket on a 2015 mission to the ISS failed during a hot-fire test.

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Dan Leone is the NASA reporter for SpaceNews, where he also covers other civilian-run U.S. government space programs and a growing number of entrepreneurial space companies. He joined SpaceNews in 2011.Dan earned a bachelor's degree in public communications...