Titan is arguably the Solar System's most unusual satellite. It is
fifty times more massive than Saturn's other moons and is the only
satellite with a substantial atmosphere. Titan shares a unique
resonance with nearby Hyperion, but otherwise sits in a particularly
large gap between Rhea and Iapetus. Titan has the largest eccentricity
of all Saturn's regular satellites and has a reasonably large orbital
tilt; its distant neighbor Iapetus has an even more impressive eight
degree free inclination. Hyperion itself is a mystery, with its
unusual orbit, extremely low density and its unique surface covered
with bizarre craters. None of these peculiarities are even partially
understood. Until now!