Question

The outer planets are made mostly of gas which makes them

Answer 1

❕❗Helium ❕❗

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Answer 2

Answer:

The four outer planets—Jupiter, Saturn, Uranus, and Neptune—are all gas giants made primarily of hydrogen and helium. They have thick gaseous outer layers and liquid interiors. All of the outer planets have numerous moons, as well as planetary rings made of dust and other particles.