Titan and Callistus (a Mosaic by NASA/JPL)

Caption NASA:"These images compare Surface Features observed by NASA's Cassini Spacecraft at the Xanadu Region on Saturn's moon Titan (left), and Features observed by NASA's Galileo Spacecraft on Jupiter's cratered moon Callistus (right).

The Cassini Radar Image, obtained during a Titan Fly-By occurred on April, 30th, 2006, is centered at about 10° South Latitude and 85° West Longitude.

The Galileo Camera Image, obtained on June 25, 1997, is centered at about 6° South Latitude and 7° West Longitude.

Titan may originally have had a cratered landscape similar to Callisto that has since been eroded by Rainfall and Runoffs. There are many large Circular Features in Titan's Xanadu Region that have some of the characteristics of impact craters - such as Central Peaks and inward-facing Circular Cliffs - which make scientists think they are, in fact, eroded Impact Craters. The Surface of Callisto also has a substantially eroded cratered landscape".