Greg Williams, deputy associate administrator, Human Exploration and Operations, NASA, speaks on a panel at "The Real Martians" event with Dava Newman, left, Jeff Sheehy, second from right, and James Green, right, on Thursday, September 17, 2015 at NASA headquarters in Washington, DC. The event was held to acknowledge NASA staff that are contributing to scientific and technological advances that will enable the journey to Mars. Photo Credit: (NASA/Aubrey Gemignani).

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Keywords: astronomy, aubrey, dava, gemignani, green, greg, headquarters, james, jeff, mars, martians, nasa, newman, real, sheehy, space, williams