[tomzz]

I didn't say transported here from a distant galaxy. IF humans were transported here, which is a big if since there are other possibilities as I noted, it was almost certainly from close by. Mars would be one possibility, but there are others. Consider Saturn's little moon Iopeta for instance:

Maybe there's some naturalistic theory as to how a moon gets a wall around it on a great circle arc which can be seen from space, but I've never heard such a theory.

The other possibility would be that they had demokkkrats or palestinians (or evolutionites) or some such there and built a wall to keep them on their own side of it.

[VadeRetro]

Maybe there's some naturalistic theory as to how a moon gets a wall around it on a great circle arc which can be seen from space, but I've never heard such a theory.

Let me take your virginity on this one. Impact. Liquification. Cooling and hardening. Small object, low gravity, tectonically inactive, high-relief structures can stay essentially forever. (Or until obliterated by subsequent impacts.)

There are lots of maria-filled craters on the moon. I'm surprised you've never seen it.

[VadeRetro]

I might also mention that it makes no sense at all to appeal to a cold, dead, tiny moon as a likely origin of humanity as opposed to Earth. It particularly won't do at all in dismissing the sister-species status of humans and chimps cited already.

Big-time non-sequitur, in fact.