Time is precious if NASA is going to send humans to explore Mars by the 2030s, NASA Administrator Charles Bolden told participants this week at the Humans 2 Mars Summit in Washington, D.C. NASA must figure out how to send not just people, but also some 200 to 400 metric tons of equipment, including a launch pad for a return trip to Earth. "We now stand on the precipice of a second opportunity to press forward to what I think is man's destiny -- to step onto another planet," Bolden said.

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