Uranus. Voyager 2 image of the upper atmosphere of Uranus,the seventh planet from the Sun. Uranus is a gas giant,composed mainly of hydrogen and helium with some methane. Its blue colour is thought to result from absorption of red light by the methane in its atmosphere. Uranus has a diameter of 51,000 kilometres,four times that of the Earth. Voyager 2 was a space probe sent to image the outer solar system. It was launched on 20 August 1977 and passed Uranus at its closest point on 24 January 1986 | |
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Credit: | Science Photo Library / NASA |
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