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Dione in approximate true color Cassini took the images for this mosaic of Dione on 24 December 2005. Infrared, green, and ultraviolet images have been processed to make the mosaic resemble Dione's approximate true color. In between larger craters, Dione's plains are very smooth, indicating a possible history of volcanism. Chasms and chains of craters are also evidence for an interesting geologic history. NASA / JPL-Caltech / SSI / Gordan Ugarkovic