The outer planets lie at great distances from the Sun,and are composed mainly of hydrogen and helium gas surrounding rocky cores (except for Pluto);they commonly are orbited by icy moons and rings of icy debris with compositions of water (H₂O),ammonia (NH₃),carbon dioxide (CO₂),and methane (CH₄).

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This statement is true. The outer planets, also known as gas giants, are composed mainly of hydrogen and helium gas, with rocky cores. They are also commonly orbited by icy moons and rings of icy debris, with compositions of water, ammonia, carbon dioxide, and methane. The exception is Pluto, which is now classified as a dwarf planet and not considered an outer planet.

The Outer Planets Lie at Great Distances from the Sun,and