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Another moon of Saturn has been imaged in detail by the Cassini spacecraft.Orbiting Saturn since 2004, therobotic Cassinigot its closest look yet at Saturn’s small moonPrometheus last week.Visible above in an unprocessed image from 36,000 kilometers away,Prometheus’ 100-km long surface was revealed to have aninteresting system of bulges, ridges, and craters. These features, together with the moon’s oblong shape and high reflectivity,are now being studied to help better understand the history ofPrometheus and Saturn’s rings.Prometheus is one of the fewshepherd satellites known, as its gravity, along with its companion moonPandora, confines many smaller ice chucks intoSaturn’s F Ring. Cassini’s next majortargeted flyby is of the moonRhea on March 2.