yes, mimas is 90% helium, 80% hydrogen
saturns moons are a reddish color
saturns main moons were discovered in 1655 and 1671-1684
There are 13 moons on Neptune.
Ganymede of Jupiter has atmospheres.
one of saturns outermost moons
Rock and ice.
Saturns moons are usually very rocky and are covered in craters. This is because it is just outside a ring of asteroids which surround the sun.
The planet Saturn has 62 moons. 53 of these moons have an actual orbit. The largest of these moons is Titan.
Mars has two moons, Phobos and Deimos, both of which are small and have very thin atmospheres. Their atmospheres consist mostly of carbon dioxide, with trace amounts of other gases such as nitrogen and oxygen. These atmospheres are so tenuous that they do not offer any significant protection or support for any form of life.
See related link for a full list of all 61 moons
There are moons in Saturn's rings, they are called shepherd moons because they help keep the rings intact.
At saturns rings which is were are some of the moons are also there