CAPE CANAVERAL, Fla. (Reuters) - More than 100 spacecraft have been to the moon, including six with U.S. astronauts, but one key piece of information about Earth's natural satellite is still missing -- what's inside.
Learning about the interior of the moon is the primary goal of a new NASA mission called Gravity Recovery and Interior Laboratory, or GRAIL, which is scheduled to launch Thursday at 8:37 a.m. (1237 GMT) from Cape Canaveral Air Force Station.
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