By: Lauryn C.


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Callisto is one of the most heavily cratered objects in space. The craters are formed by big comets and asteroids. Callisto was discovered in 1610. It is an outside moon of Jupiter. Callisto is 3,000 miles in diameter and there are 62 other moons surrounding it. Callisto is frozen and very icy. It was first observed by Voyager 1 and Voyager 2 in 1979.
Callisto: A Moon of Jupiter
(start at 6:47)
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This picture shows how big Callisto is to Earth and the moon. Earth is a lot bigger than Callisto, and the moon is a little bit smaller.
Callisto is made up of half rock and the other half ice. Callisto is almost as large as the planet Mercury. It is the second largest moon of Jupiter. Callisto shines twice as bright as the moon. It has been around for over four billion years! Callisto was actually named after a Greek god of wild animals and hunting.
Callisto was discovered by Galileo Galilei. It has a very rocky center, or core. Callisto orbits Jupiter every 16.7 days. Scientists have discovered that there may be a salty liquid underneath the surface. Scientists have also discovered a sign of solid carbon dioxide. Callisto also has a very dark surface. It has a very weak magnetic field.


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