The four formation-flying spacecraft comprising NASA’s Magnetospheric Multiscale mission, a $875 million heliophysics flagship, have arrived at Astrotech Space Operations near the Kennedy Space Center in Florida for prelaunch processing.

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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...