[ml/nj]

Don't forget that it is a comet, and occasionally approaches the sun, a significant source of warmth.

I don't think I'm the one who is forgetting anything.

No one has explained how you can get round craters in a field of ice. Melting/evaporation makes craters even more unlikely.

ML/NJ

[NicknamedBob]

"No one has explained how you can get round craters in a field of ice. Melting/evaporation makes craters even more unlikely."

Impacts come from all directions, so the thinking goes, therefore the craters should show grazing shots.

Except that the reaction to an impact from any direction is a thermal event which creates a rounded crater. Probably exacerbated by the low-gee field.