system
Given the following post, respond as if you're commenting on Reddit:
human
Why does it appear most craters on the moon are fairly true circles?

I was looking at a video of the moon and noticed that all the craters I could make out appeared to be nearly perfect circles.  I would think that an object striking the moon at an angle would form a less perfectly circular crater than a direct hit.  If the moon's gravitational pull isn't very large, and it has no atmosphere to slow objects down, why does it appear that most impacts come at a very high angle?
gpt
It doesn't have to be at a high angle to create a circular crater. If the object is moving fast enough (and it will be, since it's falling at interplanetary speeds), it will create a massive explosion when it hits. The shock wave is circular, and will be much much larger than the object itself. That's what creates the crater, not the actual path of the meteorite.