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Shrinking Moon May Be Generating Moonquakes

13 May 2019, 15:00 UTC
Shrinking Moon May Be Generating Moonquakes NASA/GSFC/Arizona State University

The Moon is shrinking as its interior cools, getting more than about 150 feet (50 meters) skinnier over the last several hundred million years. 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.

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