A panel of NASA leadership including John Grunsfeld, second from left; William Gerstenmaier, second from right; and Steve Jurczyk, right, answers questions by moderator Kent Rominger, vice president of strategy and business development, Orbital ATK, left, at the Humans to Mars Summit on Tuesday, May 5, 2015 at George Washington University in Washington, DC. The panel spoke about NASA's path to human exploration of Mars.

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