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Uranus is a "gas giant planet" with an outer atmosphere of hydrogen, helium and methane. It is about 50,000 to 51,000 km in diameter (31,000 miles) and 14.5 times the mass of Earth. The lower atmosphere includes a hot, slushy mix of water, ammonia, and methane, with a rocky core estimated at about 10,000 km in diameter, or somewhat smaller than Earth-sized.

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9y ago

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