This drawing shows the 4 Galilean satellites and the path of the Galileo spacecraft.
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This drawing shows the positions of the four Galilean satellites relative to each other, and the path of the Galileo spacecraft on one of its flyby's past Jupiter.
Of the four Galilean satellites, Io is the inside moon, Europa the next closest to Jupiter, Ganymede the third furthest out, followed by Callisto as the furthest from Jupiter.
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Callisto was first discovered by Galileo in 1610. It is the 2nd largest moon in the solar system, and is larger than the Earth's moon. It is about as big as the distance across the United States. Callisto...more
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