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Iapetus, a moon of Saturn, has many odd features, including an immense ridge of material going around its equator. As of yet it’s still unexplained. Credit: NASA/JPL/Space Science Institute
A paper has come out adding to this idea: Not long after Iapetus formed it was hit by a very large asteroid or small moon. This blasted material into space that coalesced into a moon close to Iapetus. Over time it got closer, broke apart, formed a ring, and then
that material rained down onto the surface, building up the ridge.
Wow. It sounds like a Wile E. Coyote plan, but in this case it would likely work.