Astronomy Picture of the Day . Saturn s Ancient Rings . ... Credit: Cassini Imaging Team , SSI , JPL , ESA , NASA Explanation: How old are Saturn's rings? ... Evidence for a young ring age includes a basic stability analysis for rings , and the fact that the rings are so bright and relatively unaffected by numerous small dark meteor impacts. ... Icy bright Tethys , a moon of Saturn likely brightened by a sandblasting rain of ice from sister moon Enceladus , is visible in front of the darker rings. ...