The moon may still be geologically active, judging from the way the lunar far side is wrinkling as the moon contracts. At least, that's what planetary scientists who have discovered 266 lunar "wrinkle ...
Schleicher, Lisa S., Watters, Thomas R., Martin, Aaron J., and Banks, Maria E. 2019. "Wrinkle ridges on Mercury and the Moon within and outside of mascons." Icarus ...
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