Saturn's moon Mimas, as seen by the robotic spacecraft Cassini. The crater Herschel makes a striking impression in the top image. At middle, Mimas drifts in front of Saturn's rings, and Herschel is seen from the side as the flat area on the left side of Mimas. Below, a detailed look at the layers exposed in Herschel's cliffsides.

NASA/JPL/Space Science Institute