Twin NASA craft launched to study insides of moon (AP)

A Delta II rocket, carrying the Gravity Recovery and Interior Laboratory (GRAIL) mission lifts off from the Cape Canaveral Air Force Station in Cape Canaveral, Fla., Saturday, Sept. 10, 2011.  The objective of the mission is to determine the structure of the lunar interior.(AP Photo/Terry Renna)AP - A pair of spacecraft rocketed toward the moon Saturday on the first mission dedicated to measuring lunar gravity and determining what’s inside Earth’s orbiting companion — all the way down to the core.

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