Voyager 1 took this picture of Callisto during Voyager's approach to Jupiter's outer large satellite in 1979. Both Galileo and Marius discovered Callisto in 1610. In Greek mythology, Callisto was a nymph loved by Zeus and thus hated by Hera. Hera turned her into a bear, which Zeus placed in the heavens as the constellation Ursa Major. Voyager was 350,000 kilometers from Callisto and took this picture that shows features about seven kilometers wide across the surface. Callisto is a little smaller than Ganymede (Callisto is about the size of Mercury) and it seems that it is composed of a mixture

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Photo credit: © Space collection / Alamy / Afripics
License: Licensed
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Keywords: 1979, administration, aeronautics, agency, american, astronomy, callisto, exploration, explore, gas, giant, hydrogen, jupiter, largest, moon, nasa, national, planet, planets, science, solar, space, system, technology