kirklennon t1_iy4gxj9 wrote on November 28, 2022 at 6:05 PM

The moon itself. It's a pretty big thing in its own right with its own gravitational field, and it's orbiting around Earth. A lot of things that would hit our planet end up hitting our moon instead because it's out there playing defense.
The atmosphere. If it's not big enough, it just burns up, and even if it is big, it's both smaller and slower by the time it makes it to the surface, both resulting in smaller craters. When the moon gets hit, it's full-size and full-speed.
Weather and plate tectonics. The surface of Earth is changing all the time and even a huge crater will eventually disappear. Craters on the moon more or less just stay that way until another crater lands in the same area and makes a new overlapping crater.