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Compare Uranus and Neptune – How was each found, what makes them similar?

User EnduroDave
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The interior structures of Uranus and Neptune are very similar: Thick, slushy mantle of water, ammonia & methane ices. Rocky cores about the size of the Earth. Shallow atmospheres of molecular hydrogen (H2), Helium (He) & methane (CH4).Nov 10, 2007
User Rohanagarwal
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