New research suggests that as Mimas' orbit around Saturn became less flattened, or less "eccentric" due to the ringed planet's pull ... beneath the ice crust surface of this Saturnian moon.

A new study implies that in the past, moons in our solar system may have had rings just like planets do — deepening the mystery of why no ringed moons exist today.

some research has suggested that the ancient Earth may have had rings as well ... falling onto the surface of Iapetus, just as Saturn's rings are gradually falling onto the planet.