During the Leonid Meteor Shower a few of years ago a number of amateur astromers from around the world took images of meteor strikes on the unlit portion of the moon, so it is not an uncommen event.
Because the moon does not have an atmosphere the meteors collide straight into the moon and don't burn up, and unless they hit on an unlit portion are invisible.
There was a story that some monks centuries ago saw a large meteor strike that left a crater, but calculations in the last few years conclude that what they saw was a meteor burst in our atmosphere that was close to the moon by angle of sight and the crater that was hypothersized to have been left behind was in fact many millions of years old
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