[wendy1946]

There are several places in our system which could easily have been inhabited in antediluvian times, at least by fish. Of the gas giant moons one of the more interesting is Iapetus:

Nature of course does not create planetary walls on great circle arcs. Hoagland thinks this was some sort of a death star or some such; my own theory is that there were demokkkrats or slammites or some such living on the place and the normal people guilt a wall and let the losers have their side of the place.

[Frenchtown Dan]

A very unusual formation. I’ve never seen this photo before, I’ll have to read more about Iapetus, very interesting.