SpaceX CEO Elon Musk live at the National Press Club

Delta II rocket
A Delta II rocket, the Gravity Recovery and Interior Laboratory (GRAIL) mission lifts off from the Cape Canaveral Air Force Station bound for the moon, in Cape Canaveral, Fla., Saturday, Sept. 10, 2011. It is the first mission dedicated to measuring lunar gravity and determining what's inside Earth's orbiting companion, all the way down to the core.
AP Photo/Terry Renna

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