Photo: #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.

SpaceX CEO Elon Musk live at the National Press Club

Broadcast: Midday, 09/29/2011, 12:00 p.m.

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SpaceX, one of the first commercial space transportation companies, will replace the cargo transport function of the retired Space Shuttle program for NASA. Elon Musk will discuss the future of space exploration in advance of his company's Nov. 30 flight to the International Space Station.

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