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 …

Apr 22, 2025 · Callisto is Jupiter’s second largest moon and the third largest moon in our solar system; its surface is the most heavily cratered of any object in our solar system.

Apr 19, 2023 · Callisto is Jupiter's second-largest moon and the outermost of the Galilean satellites. It has an ancient, cratered surface, indicating that geological processes could be dead.

Feb 20, 2025 · With new research strongly supporting the presence of a salty subsurface ocean, Callisto now stands alongside Europa and Ganymede as one of Jupiter’s most intriguing moons.

Callisto, outermost of the four large moons (Galilean satellites) discovered around Jupiter by the Italian astronomer Galileo in 1610. It was probably also discovered independently that same year by the …

Callisto orbits just beyond Jupiter’s main radiation belt and is the outermost of the Galilean moons – the four largest moons of Jupiter: Io, Europa, Ganymede and Callisto – discovered by Italian scientist …

Callisto is one of the four Galilean moons of planet Jupiter. It is comprised of equal parts rock and ice and is geologically dead, with it's surface covered with the oldest craters in the solar system. Callisto …

Explore Callisto, Jupiter’s ancient moon: its icy surface, potential subsurface ocean, and role in solar system history. Discover why it’s a key target for future exploration.

Callisto is the second largest moon in the Jupiter system and is nearly the size of Mercury. It is the most distant of the Galilean moons from Jupiter. It was discovered in 1610 by Galileo Galilei and …

Feb 8, 2026 · Callisto is one of four moons spotted by Galileo Galilei when he first studied Jupiter. It is the furthest of the four from the planet and is the most meteor-impacted moon of all the moons in the …