Callisto
Sign in to savesecond largest Galilean moon of Jupiter and third largest in the solar system
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Callisto is one of Jupiter's four largest moons and the third biggest moon in our entire solar system. It's notable as a heavily cratered world that scientists study to better understand the early history of the solar system and the potential for life on icy moons.
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Apparent magnitude 5.65 (opposition) Atmosphere Surface pressure 0.75 μPa (7.40×10 atm) Composition by volume≈ 4×10 molecules/cm carbon dioxide; up to 2×10 molecules/cm molecular oxygen (O2)
Callisto (/kəˈlɪstoʊ/ kə-LIST-oh) is the second-largest moon of Jupiter, after Ganymede. It is also the third-largest moon in the Solar System, following Ganymede and Saturn's moon Titan, and nearly as large as the planet Mercury. With a diameter of 4,821 km, Callisto is roughly a third larger than Earth's Moon and orbits Jupiter on average at a distance of 1.883 million km, which is about five times further out than the Moon orbiting Earth. It is the outermost of the four large Galilean moons of Jupiter, which were discovered in 1610 with one of the first telescopes, and is today visible from Earth with common binoculars.