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Gas and Ice Giants
The 4 outer planets are Jupiter, Saturn, Uranus, and Neptune. Jupiter and Saturn are gas giants (mostly hydrogen and helium). Uranus and Neptune are ice giants (methane, water, ammonia ices).
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Science — Planets and the Solar System
The 4 outer planets are Jupiter, Saturn, Uranus, and Neptune. Jupiter and Saturn are gas giants (mostly hydrogen and helium). Uranus and Neptune are ice giants (methane, water, ammonia ices).