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This is surprising, given the moon's relatively small size, said Pat McGovern, a geophysicist at the Lunar and Planetary Institute in Houston, Texas, who called the new findings a "blockbuster result."
"Small planetary bodies tend to lose their internal heat very quickly," said McGovern, who was not involved in the new research.
"Heat is what drives the overall evolution of a planet, and the moon is thought to have lost most of [its heat] long ago. But the idea that you have very young faulting going on is very exciting, because it's somewhat unexpected."
While the moon might still be shrinking, its rate of contraction is probably slowing, and shrinkage will eventually halt completely, study co-author Watters said.