MOONS
Why are there no gas moons?
The moons in the Solar System are mostly ice and rock
Of all the moons in this Solar System, only one, Titan, has an appreciable atmosphere. But even Titan is mostly made of rock and ice, which doesn’t constitute it as a ‘gas moon’. In contrast, planets like Jupiter or Saturn are made mostly of hydrogen, with the primordial gas making up 90 and 94 per cent of their respective compositions. This is why they are regularly referred to as ‘gas planets’.