Galilean Moons
Galilean Moons are the four largest moons of Jupiter, discovered by Galileo Galilei in 1610. They are named after him and are also known as the Jovian moons. The four moons are Io, Europa, Ganymede, and Callisto. They are some of the largest objects in the solar system outside of the Sun and eight planets. They are also some of the most geologically active objects in the solar system, with Io being the most volcanically active. The Galilean Moons have been studied extensively by spacecraft, including the Galileo orbiter and the Juno mission.
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