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Jupiter from Callisto
Jupiter from Callisto. Artwork of the planet Jupiter seen above ice spires on the surface of Callisto, one of its moons. Callisto has a heavily cratered surface, but in places spires of ice and rock rise some 100 metres above the surface. Their formation is mysterious, but it is thought that they were formed from material ejected in past impacts. Callisto is the second largest of Jupiter's moons. At 4,800 kilometres in diameter it is only fractionally smaller than the planet Mercury. It orbits Jupiter at a distance of 1.9 million kilometres, taking 16.7 days to complete each orbit.
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