Why is Neptune bluer than Uranus?
Quick Answer
Both planets have methane, but Neptune also has a thinner haze, letting the blue colour appear deeper. Differences in atmospheric composition and scattering change the shade.
The Full Story
Uranus and Neptune both look blue because methane absorbs red light in their atmospheres. However, Neptune appears a richer, darker blue, while Uranus is more pale and greenish. Scientists think Neptune's atmosphere has less high-altitude haze, so the methane's colour effect shows through more strongly. Observations from Voyager 2 and telescopes have helped explain this contrast. The difference is subtle but shows how small changes in atmospheric chemistry can alter a planet's appearance.
Key Facts
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"Two ice giants, two different shades of blue — why?"
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