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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.
When viewed through Earth-based telescopes, Uranus looks like a tiny blue green disk. Uranus, however, looks tiny only because it is so far away from Earth. Uranus has a diameter of about 32,000 miles (51,500 kilometers). This is about four times the diameter of Earth.