Hydrogen and Helium
Ganymede
Callisto
Io
Galileo
If you could find a bathtub big enough for Saturn, the planet would:
hydrogen and helium.
Why does Saturn radiate even more excess energy than Jupiter?
Helium rain gives off heat as it differentiates toward Saturn's center.
The reason the rings of Saturn exist is because:
the ring material lies within the Roche limit of Saturn.
the external tidal forces on an object become greater than the internal forces that hold it together.
moons that confine a narrow ring.
1
Titan is an interesting moon because:
it has a rich atmosphere that may resemble that of the early Earth.