The Moon Is Shrinking And Shaking; Maybe Generating Moonquakes', Says NASA

The Moon Is Shrinking And Shaking; Maybe Generating Moonquakes', Says NASA
The Moon is shrinking as its interior cools, getting more than about 150 feet (50 meters) skinnier over the last several hundred million years, says NASA. Just as a grape wrinkles as it shrinks down to a raisin, the Moon gets wrinkles as it shrinks. Unlike the flexible skin on a grape, the Moon’s surface crust is brittle, so it breaks as the Moon shrinks, forming “thrust faults” where one section of crust is pushed up over a neighboring part.