system
Given the following post, respond as if you're commenting on Reddit:
human
I have a question about the moon. When did all those craters happen, and why isn't it happening now?

The moon is full of craters, where are all the meteors?
gpt
A lot formed during the Late Heavy bombardment, shortly after the moons formation.  There have been a fairly constant stream since then.  The reason you don't see the same cratering rate on Earth is that we have an atmosphere and active tectonics which recycle our crust, and erode the surface.