The Moon is shrinking as its interior cools, and as a result, has gotten about 150 feet “skinnier ” over the past several hundred million years — causing powerful “lunar quakes/moonquakes,” NASA claimed.
This is because, as the moon shrinks, its brittle surface breaks forming “thrust faults”. The thrust faults are formed when one part of the crust is pushed up over a neighboring part.
“Our analysis gives the first evidence that these faults are still active and likely producing moonquakes today as the Moon continues to gradually cool and shrink,” said Thomas Watters, senior scientist at the Smithsonian’s National Air and Space Museum in the U.S.
The Moon isn’t the only world in our solar system experiencing some shrinkage with age. Mercury has enormous thrust faults — up to about 600 miles (1,000 kilometers) long and over a mile (3 kilometers) high — that are significantly larger relative to its size than those on the Moon, indicating it shrank much more than the Moon.