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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.
Why do Uranus and Neptune have a characteristic blue-green color? Methane in their atmosphere absorbs red and yellow light. Neptune emits more energy into space than it receives from the Sun, whereas Uranus does not. What visible effect does this have on the appearance of Neptune compared to that of Uranus?