NASA’s Space Technology Mission Directorate awarded 15-month contracts with a total maximum value of $3 million to four entities studying ways to improve oxygen recycling technology needed for future deep-space missions.

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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...