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Planet Saturn

Smooth Crust

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Planet Saturn - Smooth Crust

In this image of Saturn's fourth large moon, Dione, the trailing hemisphere is visible. This region was protected from billions of years of impact-gardening, which obliterated old surface features in the leading hemisphere. Icy fluids escaped to the surface through breaks in the crust and formed giant crisscrossing, wispy, bright marks on the exterior.