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As Voyager 2 left Uranus behind on January 25, 1986, and set forth on its cruise to Neptune, the spacecraft used its wide-angle camera to photograph this crescent view of Uranus. Voyager 2 was then one million kilometers (about 600,000 miles) beyond Uranus. The picture, a composite of images taken through blue, green, and orange filters, resolves features 140 kilometers (90 miles) across. The thin crescent of Uranus is seen at an angle of 153 degrees between the spacecraft and the Sun. Even at this extreme angle, Uranus retains the pale blue-green color seen by ground-based astronomers and recorded by Voyager 2 during its approach. The color is caused by methane in the Uranian atmosphere; methane absorbs light at red wavelengths and leaves blue-green as the dominant hue. The white at the extreme edge of the crescent is a high-altitude haze present in the atmosphere.