Someone did post a link on this forum a while back which showed a small, but visible, meteor impact on the lunar surface. While big impacts the likes of which so clearly scarred the lunar surface are pretty much "a million to one" shots now, there are small impacts from time to time, the same as there are here on earth except the moon doesn't have a protective atmosphere to burn up the impactors before they reach the surface.
If I can find the link I'll post it here again.
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