... Ancient Craters on Saturns Rhea . ... Credit: Cassini Imaging Team , SSI , JPL , ESA , NASA Explanation: Saturn's ragged moon Rhea has one of the oldest surfaces known. ... Like Earth's Moon , Rhea's rotation is locked on Saturn, and the above image shows part of Rhea's surface that always faces Saturn. Rhea's leading surface is more highly cratered than its trailing surface. ... Publications with keywords: Saturn - Rhea - crater . Publications with words: Saturn - Rhea - crater . ...