Saturn's Moons - Frame 3

This movie still captures the moons Mimas, Enceladus, and Dione as they begin their race across Saturn's disk. The still is from a movie created from images taken by NASA/ESA Hubble Space Telescope. It reveals the planet's rings tilted nearly edge-on toward the Sun, an event that occurs once every 15 years. Because of this special alignment, the moons cast shadows on the planet and its rings. Dione is on the left, Mimas is in the middle, and Enceladus is on the right. Dione is  casting a long shadow on the rings.