Jim Green, director of the Planetary Science Division at NASA Headquarters, answers reporter's questions following the First Landing Site/Exploration Zone Workshop for Human Missions to the Surface of Mars held at the Lunar and Planetary Institute, Friday, Oct. 30, 2015, in Houston, Texas. The agency is hosting the workshop to collect proposals for locations on Mars that would be of high scientific research value while also providing natural resources to enable human explorers to land, live and work safely on the Red Planet. Photo Credit: (NASA/Bill Ingalls)

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Keywords: bill, green, houston, ingalls, institute, jim, lunar, nasa, planetary, texas, tx, usa