"The narrow outer band in this photograph, known as the F ring (Saturn's main rings are named A to G in the order they were discovered), features channels carved into the ring by Prometheus, the oblong moon visible just inside the F ring. These so-called streamers are formed when the elliptical orbit of Prometheus brings the moon into the F ring. The gravity of the moon pulls material out of the ring, carving out a new streamer on each 15-hour orbit."
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