Cassini captured two of Saturn's moons in this image: Titan and Tethys. Titan is in the upper left, and is shrouded by a thick atmosphere that protects it from most impacts. Tethys, on the other hand, has no atmosphere, and has suffered numerious impacts, including the enormous impact that dug out the crater Odysseus. This image was taken on January 6, 2006, when Cassini was 2.7 million km (1.7 million miles) from Tethys, and almost double that distance from Titan.