Titan (IMAGE)
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The atmosphere of Saturn's largest moon hides its surface beneath a global layer of thick, opaque fogs. They are made up of organic molecules and hydrocarbons, “so large that they form particles, like the atmospheric pollution in some cities on Earth, and which are deposited on the surface”, says Rafael Silva, adding: “There could be even more interesting chemistry there.”
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NASA/JPL-Caltech/Space Science Institute
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