Steve Jurczyk, associate administrator of the Space Technology Mission Directorate, NASA, right, speaks on a panel with John Grunsfeld, associate administrator for the science mission directorate, NASA, second from left, and William Gerstenmaier, associate administrator for the Human Exploration and Operations Directorate, NASA, second from right, 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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