An F-Ring Beauty for Year's End

A close-up of the F ring shows dark gores in its interior faint ringlets following the passage of Prometheus. Each gore represents a single interaction of the moon with the F ring material. The gores shear out over successive orbits, becoming the long, curving features seen here.

(Look here for a shot of Prometheus passing and pulling out streamers.)

The dark Keeler gap (42 kilometers, or 26 miles wide) is seen at right. The F ring core is similar in scale to the gap, at about 50 kilometers (30 miles) in width.