John Grunsfeld, associate administrator, science mission, NASA, left, speaks on a panel with Jim Green, director of planetary science, NASA, center, and Michael Meyer, lead scientist, Mars Exploration Program, NASA, right, at a news briefing announcing the presence of water on Mars on Monday, September 28, 2015 at NASA Headquarters in Washington, DC. The findings are being presented this week at the European Planetary Science Congress in France and are detailed in a research paper titled, "Spectral Evidence for Hydrated Salts in Seasonal Brine Flows on Mars." Photo Credit: (NASA/Aubrey Gemigna

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John Grunsfeld, associate administrator, science mission, NASA, left, speaks on a panel with Jim Green, director of planetary science, NASA, center, and Michael Meyer, lead scientist, Mars Exploration Program, NASA, right, at a news briefing announcing the presence of water on Mars on Monday, September 28, 2015 at NASA Headquarters in Washington, DC. The findings are being presented this week at the European Planetary Science Congress in France and are detailed in a research paper titled, "Spectral Evidence for Hydrated Salts in Seasonal Brine Flows on Mars." Photo Credit: (NASA/Aubrey Gemignani)

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