Io: Closest to Jupiter, Most volcanic object in solar system, Shorest orbit of the Galilean Moons, Europa: 2nd closest Galilean Moon to Jupiter, smooth icy crust, liquid ocean beneat, best chance for life, Ganymede: 3rd closest Galilean Moon to Jupiter, Largest Galilean Moon, Larger than Mercury, surface of mixed ice and rock, Has own magnetic field, Callisto: Farthest Galilean Moon from Jupiter, Very old, cratered surface, Tells us about the early solar system, MAY have a liquid ocean,

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