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Callisto It is the second satellite in Jupiter size, after Ganymede. It has a diameter of 4,820 km. times that of the Moon, a mass of approximately (1.5 times that of the Moon. It is an average of 1,880,000 km. from the planet and orbits around it with a period of sixteen days, sixteen hours thirty two minutes.

It is one of the four Galilean satellites (Io, Europa, Ganymede and Callisto, in order of distance from Jupiter), named after them because Galileo Galilei discovered them.

After the imperfect observations made from Earth, Callisto, like the other Jupiterian satellites, has been closely watched by the two American Voyager probes. It has captured an image of a world devoid of atmosphere, but with an icy surface and much more densely covered with craters than our Moon.

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