>>21134692Almost all craters are indeed circular, regardless of the impact direction. The reason for this, as far as I can figure out, is that the speed is so high - many times faster than a bullet - that the energy of impact greatly exceeds the momentum.
The crater is formed in an explosion rather than being gouged out leaving a trace of impact direction.
All those craters are excavated by the explosive impact of a relatively tiny object.
Meteor Crater in Arizona is more than a kilometre across, yet the impactor was only about 50m. These are blast craters which is why they are circular.
