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 independently observed by Simon Marius.

Callisto (/ k ə ˈ l ɪ s t oʊ / kə-LIST-oh), or Jupiter IV, is the second-largest moon of Jupiter, after Ganymede. In the Solar System it is the third-largest moon after Ganymede and Saturn's largest moon Titan, and nearly as large as the smallest planet Mercury.

2024年11月1日 · 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. Images of Callisto captured by passing spacecraft show bright …

2023年4月19日 · 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. However, it may...

2017年7月5日 · Callisto is Jupiter’s 2nd-biggest moon, and the 3rd-biggest moon overall in the solar system. It was discovered by Galileo in 1610.

2025年1月24日 · 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 German astronomer Simon Marius, who named it after Callisto of Greek mythology.

Callisto is the eighth moon of Jupiter and the second largest of the planet's known satellites. It is the third largest moon in the solar system and is similar in size to the planet Mercury.

Callisto is the second largest moon orbiting Jupiter and is the third largest moon in our entire solar system. Callisto is covered in craters which means that it has had been hit by a lot of asteroids and comets throughout its history.

Callisto makes up one of the four Galilean moons of Jupiter, along with the massive Ganymede, fiery Io and smooth Europa. But what makes Callisto unique and sets it apart from the others? Well, lets look at some facts about Callisto to learn exactly what this moon is about. Left to Right: Ganymede, Callisto, Io and Europa

Fast Summary Facts About The Moon Callisto. Discovered: January 7 th, 1610 by Galileo Galilei; Name: Named after the Greek mythological lover of Jupiter; Size: Diameter of 4,821 km (2,996 miles) Moon Rank: 3 rd Largest in the Solar System; Surface Gravity: 0.126g (12.6% of Earth’s!) Orbit: Prograde and slightly Eccentric; Orbit Radius ...