As NASA gears up to send human beings back to the moon during the still-to-be-scheduled Artemis III mission, researchers with the federal agency are learning more about the geologic profile of Earth’s lone satellite — including that it, apparently, has been shrinking.

A study published recently found that a proposed landing site for NASA’s long-anticipated manned trip is flush with steep surface ripples caused by “moonquakes” — the lunar equivalent of earthquakes, which occur through a combination of interior cooling and the Earth’s gravitational pull.

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