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Violent past revealed by map of moon's interior

Gravity survey reveals churned-up layers just beneath lunar surface

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SAN FRANCISCO — The moon is cooling and shrinking today, but early in its history it actually got bigger, scientists have found.

As the moon expanded, molten rock rose from its deep interior to cool and solidify into long gashes buried beneath the surface. For billions of years these fiery scars remained hidden, finally revealing themselves to a pair of spacecraft flying overhead.

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