Galilean Moon [46]The moons of Jupiter Galilean Moons Galilean moons of Jupiter the cause of all this constant activity is actually Jupiter Galileo discovered these moons in 1610 100 km thick surface is composed of water ice metallic core and rocky mantle Galilean Moons salty liquid ocean beneath its surface [46]The moons of Jupiter Io’s surface is also one of the youngest Galilean moon Europa and Ganymede moons, moons,