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Saturn shows its uniquely prominent ring system in this image taken by the Voyager 2 probe in 1981. The satellites Tethys, Dione and Rhea are visible at left, with the shadow of Tethys visible on the planet's southern hemisphere. Credit: NASA
Saturn shows its uniquely prominent ring system in this image taken by the Voyager 2 probe in 1981. The satellites Tethys, Dione and Rhea are visible at left, with the shadow of Tethys visible on the planet's southern hemisphere. Credit: NASA