NASA is making progress on its journey to send humans to Mars, but it will take tenacity, flexibility and the cooperation of scientists and engineers from around the world.

“We’re on pace… to send American astronauts to Mars in the 2030s,” said NASA administrator Charles Bolden, speaking at the Humans to Mars Summit in Washington, D.C. “We could say we don’t know today how to get to Mars. But we know enough… This plan is clear. This plan is affordable. And this plan is sustainable.”

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