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NASA's Lunar Reconnaissance Orbiter Reveals 'Incredible Shrinking Moon'
"Newly discovered cliffs in the lunar crust indicate the moon shrank globally in the geologically recent past and might still be shrinking today, according to a team analyzing new images from NASA's Lunar Reconnaissance Orbiter (LRO) spacecraft. The results provide important clues to the moon's recent geologic and tectonic evolution."
This isn't really surprising. After all, all current theories about the Moon's origin suggest it was originally molten. Liquids tend to have greater volume than solids so, as the Moon cools, it would have shrunk. As the Moon has no atmosphere to weather the surface, we can expect to see the contraction scars on the surface to this day, even if the event is billions of years old.
It does go to show how Apollo barely scratched the Moon's surface, literally as well as figuratively. There is still a lot more to learn about that world.