The glowing arc of light in this image is the icy F-ring. Saturn's moon Rhea (1528 kilometers across) can be seen in the background, illuminated by the reflected light of both Saturn and its rings. Only the narrow strip of light at the lower edge of the moon arrives directly from the Sun.
This picture was taken on 30 October 2005 by the narrow-angle camera onboard Cassini from a distance of approximately 689 000 kilometres. The resolution of the image is about four kilometres per pixel.