The Rings, 26 Taurus and reddish Hydrogen

This image is a false-color ultraviolet view of Saturn's B-Ring (center) and A-Ring (right), separated by a large gap known as the Cassini Division.
It shows a bright horizontal streak, created by a series of time lapse images involving a star named 26 Taurus.
The image was made over a 9-hour period as the star drifted behind the Rings. The opacity of the outer A-Ring is most pronounced on its inner edge, indicating more ring debris is present there. The Encke Gap, much smaller than the Cassini Division, is visible near the outer edge of the A-Ring. The B-Ring is significantly more opaque than the A-Ring, indicating a greater density of ring material when imaged from above.
The sky behind the Rings glows red in the ultraviolet wavelengths from the hydrogen gas that fills the Solar System.

The images were processed from data taken by the ultraviolet imaging spectrograph aboard the Cassini spacecraft in May 2005.