This true-color image taken in visible wavelengths by the Cassini spacecraft on June 10, 2004 and released by NASA on Friday, July 2, 2004, shows Titan, a moon of Saturn, enveloped in a photochemical smog.  At least one of many large, lake-like features on Saturn's moon Titan studied by the international Cassini spacecraft contains liquid hydrocarbons, making it the only body in the solar system besides Earth known to have liquid on its surface, NASA said Wednesday.(AP Photo/NASA, FILE) (AP Photo/ NASA, JPL, FILE)
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