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Most satellites have no fog layers on them. Why does Titan have two? The images of the Cassini spacecraft, which entered Saturn's orbit in July 2004, confirm that the most mysterious moon in the solar system is covered not only by a dense atmosphere, but also has two distinct spheres of mist.
These two layers can be seen in violet in the ultraviolet image of false color that we have above. The opaque atmosphere of Titan resembles that of Earth in that it is composed of nitrogen for the most part. It seems that when sunlight meets nitrogen and atmospheric methane at high altitude, traces of organic compounds such as ethane or carbon dioxide are formed.
It is likely that these and other complex organic molecules exist in the separate mist layer.
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