The Moons of Jupiter

Jupiter's moons are natural satellites orbiting the giant planet. As of now, astronomers have confirmed over 80 moons, with the four largest—Io, Europa, Ganymede, and Callisto—called the Galilean moons, discovered by Galileo in 1610. These moons vary in size, composition, and geological activity: Io is volcanic and geologically active; Europa has a salty ice surface that may hide a subsurface ocean; Ganymede is the largest moon in the solar system with a magnetic field; and Callisto has an ancient, heavily cratered surface. These moons offer diverse environments, making Jupiter's system a fascinating subject of scientific study.