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Not much. It is a static (unchanging) environment. Once every couple of weeks the sun either sets or rises--the lunar day is about a month long. From time to time a tiny meteorite smacks into the surface. These events are quite rare. Once in awhile a really big meteorite whacks the moon, tossing up a bunch of debris. This happens every few million years or so.

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15y ago

What else can I help you with?