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Clouds on Titan, artwork
Clouds on Titan, artwork. Titan is the largest moon of Saturn (ringed planet at upper right). Titan's atmosphere is predominantly nitrogen. It is thought that the action of sunlight on traces of methane forms clouds of complex hydrocarbons and liquid hydrocarbons on the surface. Titan orbits at a distance of over 1.2 million kilometres from Saturn, a gas giant planet that is the sixth planet from the Sun. Saturn is over 1.4 billion kilometres from the Sun (seen rising at centre left), and surface temperatures on Titan can reach minus 183 degrees Celsius.
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