What is the brightest moon in the solar system?
The chilly average temperature of -330°F would lead one to believe that this moon is composed of solid ice. However, the huge variations in the surface led scientists to believe that there is an active liquid core, with some volcanism which has resurfaced the planet. One explanation for the heat required to maintain the liquid is the tidal mechanisms exerted on the moon by Saturn and the surrounding moons, similar to the tidal forces that heat Jupiter’s moon, Io.
