What is a gas planet made out of?

Answer 1

The gaseous planets, Jupiter, Saturn, Neptune and Uranus have atmospheres mostly consisting of hydrogen, helium and methane.

Answer 2

Gas planets, such as Jupiter and Saturn, are primarily composed of hydrogen and helium, with smaller amounts of other gases like methane and ammonia. These planets lack a solid surface and instead have thick atmospheres that extend many thousands of kilometers into space.