This is a drawing which illustrates the composition of the atmosphere of Uranus relative to possibilities for other planets.
Click on image for full size
A Look at what Uranus' Atmosphere is Made of
Unlike Jupiter and Saturn, where the atmosphere is made the simple molecules hydrogen and helium, the atmosphere of Uranus is cold enough to contain
more of a complex molecule called methane.
Uranus' atmosphere originally formed from complex molecules and ice, rather than the simple molecules of which Jupiter and Saturn formed.
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