In another animation made from raw images taken by Cassini, Mimas passes in front of Rhea (?), whose face is partially covered by Saturn’s rings…which in turn are darkened by the shadow of the planet itself.
I removed distracting background stars, as well as dust and streaks often seen in raw photos.
Rhea is 950 miles wide, while Mimas is less than 250 miles across. Both are considered the most cratered worlds in the solar system, and are composed of large amounts of water ice. Ice, easily liquefied into water here on Earth, is permanently frozen and hard as rock in the -350º F temperatures found at those distances from the sun.
Raw images: NASA/JPL/Space Science Institute. Animation: J. Major.