Alfred McEwen, principal investigator, High Resolution Imaging Science Experiment (HiRISE), University of Arizona, speaks by phone at a news briefing announcing the presence of water on Mars on Monday, September 28, 2015 at NASA Headquarters in Washington, DC. Panelists John Grunsfeld, associate administrator, science mission, NASA, left; Jim Green, director of planetary science, NASA, center; and Michael Meyer, lead scientist, Mars Exploration Program, NASA, right, also contributed to the briefing. Photo Credit: (NASA/Aubrey Gemignani)

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