Tom, you MUST have done dishes.

KIDDYING! :) (somewhat)

[Uranus' newly discovered moon, Mab, is a small, dead, rocky ball only about 15 miles across—one-twentieth the diameter of Enceladus.

The scientists however suspect that both of these rings are subject to forces acting on dust in the rings, which allow the tiny particles to survive while the larger ones are captured by their moons.

These fragments are subject to forces that push them away or toward the planet out of the moon's orbit. The result is a ring of small particles, each only a fraction of a human hair in width, that reflect and scatter mostly blue light.

"This model can be transferred directly to what we now see in Uranus," de Pater said. "Although we still need to understand the details of the process."]

Tidal heating can do wonderful things to an icy rocky body (coupled with a host of other things... radiation...).