Why are Uranus and Neptune two different hues of blue?
The two worlds are quite similar in mass to each other – Uranus is roughly 15 times the mass of Earth, while Neptune is at 17 – with nearly identical atmospheric compositions of hydrogen (more than 80% each), helium and methane. But now, new research suggests that a “stagnant, sluggish” atmosphere on Uranus allows haze to build up and concentrate on the gas giant, making it a “whiter” cyan blue than Neptune’s cerulean.
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