Saturn: Dirty Rings and a Clean Moon . ... Credit Copyright: Cassini Imaging Team , SSI , JPL , ESA , NASA Explanation: Eating surface ice from Enceladus might be healthier than eating ice from Saturn's rings -- it certainly appears cleaner. ... For reasons that are not yet understood, however, many of Saturn's ring particles have become partly coated with some sort of relatively dark dust, while the surface of Enceladus appears comparatively bright and clean. ... NASA Official: Jay Norris. ...