The Cassini spacecraft's radar camera has "revealed geological features similar to Earth on Xanadu, an Australia-sized, bright region on Saturn's moon Titan," says NASA. The radar image was made on April 30, 2006. Quicktime movie, detail images (1) (2). The picture at right is from another Cassini image, a June 11, 2006, photograph in visible light of Titan and Rhea together. Details.