Mimas, Enceladus, Tethys, Dione, Rhea, Titan, Hyperion and Iapetus. Io, Europa, Ganymede and Callisto. Titan has a thick atmosphere of mostly nitrogen. Titan is only slightly smaller than the moon Ganymede. The average density of Titan is the same as the Earth s moon.
Titan is closer to Saturn than any other major moon.
The surface of Titan isn t visible through the thick layer of clouds and haze. The major moons of Uranus are Io, Europa, Ganymede and Callisto. Triton, Nereid and Proteus. Miranda, Ariel, Umbriel, Titania and Oberon. Mimas, Enceladus, Tethys, Dione, Rhea, Titan, Hyperion and Iapetus.