WASHINGTON — Orbital Sciences Corp. on Oct. 1 rolled the first stage of its Antares rocket out to the launch pad at NASA’s Wallops Island Flight Facility to prepare for a series of tests that, if successful, will clear the way for the company to begin routine cargo deliveries to the international space station sometime next 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...