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Jupiter and the Galilean moons seen from Leda
Jupiter and its Galilean moons. Montage of images of Jupiter and its four largest satellites. These are known as the Galilean moons as they were discovered by the astronomer Galileo in 1610. The moons, in order of increasing orbital distance from Jupiter, are; Io (second right), Europa (centre), Ganymede (left) and Callisto (right). The rocky foreground represents the surface of Leda, the next moon out in the Jovian system. The images of Jupiter and the Galilean moons used in this montage were gathered by Voyager spacecraft in 1979.
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