A new image taken by the Cassini spacecraft of Saturn's moon Titan reveals never seen before details that suggest geologic activity. In this false-color composite, yellow areas correspond to hydrocarbon-rich regions and the green areas are icier regions. The circular feature is thought to be a possible impact crater. More info(1)
1. http://science.nasa.gov/headlines/y2004/04jul_titanrevealed.htm?list1049228