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What covers the river channels seen on Titan’s surface?
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Titan
Titan, moon of Saturn, photographed by Voyager 2 on August 25, 1981, at a distance of 907,000 km (564,000 miles). Green and violet images were combined to make this photograph, which shows the extended atmosphere of the satellite.
The river channels observed on the surface of Titan are coated with dark hydrocarbon deposits.1