"The outer ring of Saturn is blue and has Enceladus right smack at its brightest spot, and Uranus is strikingly similar, with its blue ring right on top of Mab's orbit," said Imke de Pater, professor of astronomy at the University of California, Berkeley.
All other rings, such as the those around Jupiter, Saturn, Uranus, and Neptune, sport a reddish color because they are composed of larger particles that reflect red light. The particles themselves may also be reddish, possibly from iron.
The color of Saturn's blue ring has been credited to the tiny particles spewed into space by Enceladus as it orbits around the planet. But the same probably isn't true for Uranus, scientists say.
