A shadow's over Saturn!

Caption NASA originale:"The shadow of Epimetheus, one of Saturn's co-orbital moons, races across the Planet's restless cloud tops. Epimetheus cruises along beyond the orbits of the narrow F-Ring and its shepherd moons.
Farther south on Saturn, the swirls and eddies are obscured by the shadow of the outer A-Ring and its two prominent, moon-containing gaps, Encke (bottom) and Keeler (dim, at the A-Ring edge).
The image was taken with the Cassini spacecraft wide-angle camera using a spectral filter sensitive to wavelengths of infrared light centered at 728 nnmts. The view was obtained on June 30, 2006, from a distance of approximately 335.000 Km (about 208.000 miles) from Saturn.
Image scale is approx. 16 Km (a little less than 10 miles) per pixel".