As NASA completes its 125th space shuttle mission, attention is shifting to the next phase of space exploration, which will take astronauts back to the moon, and eventually to Mars. "We will go to the moon -- anywhere on the moon. We will stay twice as long as Apollo did with twice as many people, and be able to bring that crew home any time," says Jeff Hanley, manager of NASA's Constellation Program, in an interview with ABC News.

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