There are three large seas, all located close to the moon's north pole, surrounded by numerous of smaller lakes in the northern hemisphere. Just one large lake has been found in the southern hemisphere.
Known severe upsets of the terrestrial environment and interruptions in the progress of ancient civilisations, together with our growing knowledge of interplanetary matter in near-Earth space, indicate the arrival of a centaur around 30,000 years ago.
NASA's Cassini has returned some stunning images of the Saturn's two moons, Dione and Enceladus on Wednesday. Though the surface of these two moons are made up of nearly the same material but Enceladus has a considerably higher reflectivity than Dione.