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The color of Uranus is a blue-green color, and the color of Neptune is a bright azure blue. The reason this is the color of Uranus is due to its atmosphere and its ability to absorb different bands of light.
How do we know what causes Uranus and Neptune to appear blue? The key to determining the cause of the color of a planet lies in light. While this may seem obvious, since the color of a planet is based on light, there is a much more sophisticated way to use light to determine more precisely what materials ie. elements and compounds cause the colors that we see.