Wow a cool discovery. article from slashdot.org:

Saturn’s Moons Built From Ring Material

Posted by CmdrTaco on Friday December 07, @09:04AM
from the lookit-all-them-moons-up-there dept.

LiquidCoooled writes “Two of Saturn’s small moons look eerily like flying saucers, new observations by the Cassini spacecraft reveal. The moons, which lie within the giant planet’s rings, may have come by their strange shape by gradually accumulating ring particles in a ridge around their equators.”