Prometheus at work

Remember the picture of gores in the F ring, or the one of the streamers there? Or the little movie of Prometheus passing by? Well, check out this gorgeous shot of Prometheus and its handiwork in the F ring:

As the Cassini website says,

Prometheus interacts gravitationally with the inner flanking ringlets of the F ring, creating dark channels as it passes.

This image was taken in a complete azimuthal scan of the rings, during which Cassini followed Prometheus (102 kilometers, or 63 miles across) around the rings for one complete orbit, or about 14 hours.

This view looks toward the unlit side of the rings from about 41 degrees above the ringplane. The moon is partly lit by sunlight (at left) and elsewhere lit by reflected light from Saturn.

(Note, too, the extreme difference between the A ring's outer edge and inner area, as pointed out by Joshua Colwell below.)