NASA spacecraft to probe the inside of the moon (Reuters)

NASA's Lunar Reconnaissance Orbiter (LRO) image released on September 6, 2011 shows the Apollo 17 site on the moon, where the tracks laid down by the lunar rover are clearly visible, along with the last foot trails left on the moon. REUTERS/NASA's Goddard Space Flight Center/ASU/HandoutReuters - 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.

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