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Callisto (moon)

Adapted from Wikipedia · Explorer experience

A colorful mosaic image of Jupiter's moon Callisto, captured by NASA's Voyager 2 spacecraft, showcasing its natural surface features.

Callisto: A Distant Moon of Jupiter

Callisto is a big moon that orbits the planet Jupiter. It is the second-largest moon of Jupiter, just a little smaller than Ganymede, which is the biggest. Callisto is also the third-largest moon in our whole Solar System! It is almost as big as the planet Mercury, but it is much farther away from Jupiter than Earth’s Moon is from Earth.

Callisto is one of the four large moons that Galileo Galilei and Simon Marius discovered in 1610 using one of the first telescopes. These four moons are called the Galilean moons. Today, you can sometimes see Callisto with just a pair of binoculars!

Callisto’s surface is very old and covered with many craters, which are like big dents from space rocks hitting it long ago. It does not have moving pieces like Earth (called plate tectonics) or volcanoes like Io (called volcanism). But scientists think there might be a hidden ocean of water deep inside Callisto. This makes some people wonder if tiny, tiny life could live there, even though it might be harder than on another moon called Europa.

Many space probes have visited Callisto. The Pioneer 10 and Galileo spacecraft flew by and took pictures. Because Callisto has low radiation, it might be a good place for future space missions to study Jupiter and its moons.

Images

A large crater on Jupiter's moon Callisto, showing the unique geological features of our solar system.
A comparison showing the sizes of the moon, Earth, and the moon of Jupiter called Callisto.
A colorful map showing the surface of Jupiter's moon Callisto, with blue areas indicating regions rich in water ice and reddish areas showing rocky terrain.
A detailed map of Jupiter's moon Callisto, showing its surface features and geography.
A crater on the surface of Callisto, one of Jupiter's moons, captured by NASA's Galileo spacecraft.
A scientific image showing the icy, knobby terrain on Jupiter's moon Callisto, highlighting how erosion shapes its surface over time.
An artist’s illustration of a futuristic human research station on Callisto, one of Jupiter’s moons.
A colorful montage of planets in our solar system, showing Mercury, Venus, Earth with its Moon, Mars, Jupiter, Saturn, Uranus, and Neptune. These images were captured by NASA spacecraft and help us learn about the sizes and appearances of planets in space.
A beautiful montage of the planet Jupiter and its four largest moons—Io, Europa, Ganymede, and Callisto—taken by the Voyager 1 spacecraft.
A colorful view of Jupiter's turbulent clouds, showing swirling patterns and bright oval weather systems captured by NASA's Juno spacecraft.
Animation showing the orbits of Jupiter's four largest moons: Io, Europa, Ganymede, and Callisto.

Related articles

Moon of Jupiter
Ganymede (moon)
Mercury (planet)
Moon
Galileo Galilei
Simon Marius

This article is a child-friendly adaptation of the Wikipedia article on Callisto (moon), available under CC BY-SA 4.0.

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