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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.
What causes the blue-green color of Uranus? The amount of helium in its atmosphere. Uranus's atmosphere is made mostly of methane, which reflects bluish-green light.   The absorption of red light by methane crystalsâ¦ in the upper atmosphere of Uranus gives it its blue/green appearance.