Atmosferic Distortion (natural colors; credits: NASA/JPL/Space Science Institute)

Caption NASA:"Mimas emerges from behind hazy Saturn. The Rings appear (slightly) distorted near the Planet as their image passes through the Upper Atmosphere.
The limb of Mimas (about 396 Km, or approx. 246 miles across) is slightly flattened on the left side by the rim of the large crater Herschel (see also PIA08278).

This view looks toward the unilluminated side of the Rings from about 9° above the Ring-Plane. Images taken using red, green and blue spectral filters were combined to create this natural color view. The images were acquired with the Cassini Spacecraft narrow-angle camera on Nov. 30, 2007 at a distance of approx. 1,7 MKM (such as about 1,1 MMs) from Mimas.
Image scale is roughly 10 Km (about 6 miles) per pixel on Mimas".