Saturn and three of its moons, Tethys, Dione and Rhea, from 13 million miles. Caption: A true-color picture of Saturn assembled from Voyager 2 images obtained on 4 August 1981 from a distance of 21 million km (13 million miles). Moons Tethys, Dione and Rhea are also in the frame. Copyright: Credit: National Optical Astronomy Observatories