SUMMARY: NASA's Cassini spacecraft took this image of Saturn's F-ring, with one of its shepherd moons, Pandora also in view. Pandora is only 84 km (52 miles) across, but it clearly has a powerful effect on the ring, causing ripples, knots and twists in the ring from afar. You can see the entire shape of Pandora in this picture, because reflected light from Saturn illuminates the moon's dark side.

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