NASA recently released photos from lapetus, Saturn's outermost large two-face moon.  Lapetus has a bright, heavily cratered icy terrain and a dark terrain.  An interesting tidbit on the Cassini mission is that the spacecraft is named after Italian astronomer Giovanni Domenico Cassini, who discovered lapetus in 1671.

Since the discovery, scientists have been puzzled by the fact that the moon has two hemispheres: one dark (the side facing forward) and one light (the trailing hemisphere, which reflects about 50 percent of sunlight).  Lapetus always shows the same face to Saturn, and it is hoped that the Cassini mission will be able to finally discover the reason behind the mysterious dichotomy.  One theory is that the dark hemisphere is being coated with particles being ejected from Phoebe, a tiny Saturn moon.