Orbital Sciences Corp. rescheduled the maiden launch of its Antares rocket for no earlier than April 19 after an ethernet cable linking the ground control center here with the computer on the second stage of the launcher came loose at the launch pad.

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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...