Tests of the main-stage engine for NASA’s planned Space Launch System (SLS) heavy-lift rocket continued at the Stennis Space Center in Mississippi as the agency fired up an RS-25 engine for the third time this year.

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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...