The surface of Callisto is an unequivocal symbol of his age. Although it will probably form at the same time as Io, the difference between the surfaces of these two Jupiter satellites is quite evident and important.
The surface of Io is young, it barely shows craters due to meteoric impacts, and is continually regenerating due to explosions and lava rivers coming from the great volcanoes. Calisto has an aged surface, which shows the highest density of craters in the Solar System, and neither volcanoes nor large mountains appear on its surface. Callisto's surface is like a large ice field, full of holes and craters due to millions of years of collisions with interplanetary debris.
The photograph was taken in May 2001 and is, in fact, the only full-color complete taken by the Galileo probe orbiting Jupiter.
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