Their orbits around Saturn have nothing of the neat order of Jupiter's satellites. Saturn's moons have a more random sequence and reveal a violent history. Janus and Epimetheus are twins and share the same orbit, halves of a once complete world. Tethys and Mimas are ravaged by enormous craters and Saturn's rings themselves may be the remains of a shattered satellite of old. The largest, Titan stands out as the only moon we know with an atmosphere.
Titan is cloaked in foggy orange clouds, an atmosphere one and a half times denser than Earth's.