WASHINGTON — When asteroid-mining venture Planetary Resources held its coming out party in April at Seattle’s Museum of Flight, the startup, backed by a roster of high-profile billionaires, got the desired effect: media headlines and rave reviews from space enthusiasts.

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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...