This image shows a close-up view of a density wave in Saturn's A ring. It was taken by the narrow angle camera on NASA's Cassini spacecraft after successful entry into Saturn's orbit.

This image shows a close-up view of a density wave in Saturn's A ring. It was taken by the narrow angle camera on the Cassini spacecraft after successful entry into Saturn's orbit. The view shows the dark, or unlit, side of the rings.

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