天王星の大気(Atmosphere of Uranus)は、木星や土星等の木星型惑星の大気と同様に、主に水素とヘリウムで構成されている。深部では、水、アンモニア、メタン等の揮発物が多い。上層はその反対で、温度が低いため、水素、ヘリウムより重い気体はほとんどない。天王星の大気は、太陽系の全ての惑星の中で最も冷たく、49Kにも達する。
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