Dione Dwarfing Rhea • Is Dione (698 miles or 1123 kilometers across) suddenly larger than Rhea (949 miles or 1527 kilometers across)? No, of course not. Cassini simply captured an image when Dione was much closer to the camera, making the moon appear much bigger than her larger sister moon. Besides their beauty, images like these can help Cassini's navigators determine exactly where the spacecraft is and confirm that it's on course. This view looks toward the trailing hemisphere of Dione. North

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