Shades of Uranus: Scientists know why the planet and Neptune are different hues of blue

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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