Dr. Alex MacDonald, Program Executive for Emerging Space, Office of the Chief Technologist, NASA, left, responds to a question by interviewer, Dr. Tara Ruttley, right, during NASA's "Real Martians" event 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: alex, astronomy, aubrey, gemignani, headquarters, macdonald, mars, martians, nasa, real, ruttley, space, tara