Spokes!

Caption NASA:"The Cassini Spacecraft spies multiple spokes in Saturn's outer B-Ring. The precise origin and evolution of these transient features continue to provide Ring Scientists with intriguing puzzles to solve.
Most of these spokes are about 4000 Km long; the 2 near the bottom of the scene are about 1000 Km (about 600 miles) wide.
This view looks toward the unilluminated side of the Rings from about 8° above the Ring-Plane.

The image was taken in visible green light with the Cassini spacecraft narrow-angle camera on June 2, 2007. The view was acquired at a distance of approx. 2,2 MKM (such as about 1,4 MMs) from Saturn.
Image scale is roughly 13 Km (about 8 miles) per pixel".