[meadsjn]

Besides, methane explosions wouldn't explain why all of the bays are elliptical.

Couldn't possibly have been caused by huge rocks hitting the surface from an angled flight path???

[UnbelievingScumOnTheOtherSide]

Couldn't possibly have been caused by huge rocks hitting the surface from an angled flight path???

Actually, no. Meteorites striking a surface make round holes except at the most extreme angles and then they make streaks or skip (making a line of round holes). That's why you don't see a lot of oval craters on the moon, most of which were made by angled impacts.