[VadeRetro]

I'm not scoring very high on guessing what real astronomers think. For one thing, I didn't know all the elements of the problem, such as the symmetry the ridge exhibits with the light-dark pattern on Iapetus.

http://www.universetoday.com/am/publish/iapetus_consume_saturn_ring.html

Anyway, the "rindge" as the author calls it (evidently a combination of "rind" and "ridge") is 12 miles high.

[VadeRetro]

Your dismissals invited on the article linked in 1501.

[Doctor Stochastic]

[Jaguarbhzrd]

Iapetus placemarker