Clouds swirl through the atmosphere of the planet. Prometheus (86 kilometers, or 53 miles across) orbits between the main rings and the thin F ring, and this moon appears as a speck above the rings near the middle of the image.
This view looks toward the southern, unilluminated side of the rings from about 3 degrees below the ringplane.
The image was taken with the Cassini spacecraft wide-angl [...]
Full story at http://spacefellowship.com/news/art23582/great-view-of-a-crescent-saturn.html
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