The "Ring-Masters"

Caption NASA:"This view looks down onto the unlit side of Saturn's Ringplane. It nicely shows a near-arm/far-arm brightness asymmetry in the B-Ring: The near arm of the B-Ring (in the lower half of the image) is notably darker from this viewing geometry than is the far arm (above).
Imaging scientists believe this to be a manifestation of the reflection of light from the disk of Saturn falling predominantly on the far arm of the Rings. (At the time this image was taken, Cassini was more or less on the dark side of the Planet.) As the B-Ring is the thickest part of Saturn's Rings, it scatters less sunlight from below, and reflects more Saturnshine from above, than either the A or C-Rings, making the effect look more dramatic in the B-Ring. Two small moons appear in this scene as well: Atlas and Pandora (32 and 84 Km across, respectively); between the two moons lie multiple clumps of material in the F-Ring.

The image was taken in visible light with the Cassini spacecraft wide-angle camera on July 25, 2006 at a distance of approximately 1 million kilometers (600,000 miles) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 128 degrees. Image scale is 58 kilometers (36 miles) per pixel.