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What is Uranus's atmosphere composed of?

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Like the giant planets Jupiter and Saturn, Uranus has a thick atmosphere of hydrogen, helium, and methane; a relatively low density; and a rapid period of rotation of about 17.9 hr, which causes a polar flattening of over 6%.

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Get more facts and information about Uranus (astronomy) . Or, view the full encyclopedia entry from The Columbia Encyclopedia, Sixth Edition.

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