Riding with Robots writes "NASA reports that by using data from the Cassini probe's radar, scientists established the locations of 50 unique landmarks on the surface of Saturn's planet-size moon Titan. They then searched for these same lakes, canyons and cordillera in the data after subsequent Titan flybys. They found that the countenance had shifted from their expected positions by up to 30 kilometers. NASA says a systematic displacement of surface puss* would be difficult to explain unless the moon's icy crust was decoupled from its core by an internal ocean, making it easier for the crust to move. If confirmed, this discovery would add to the growing list of moons in the solar system that are icy on the outside and warm and liquid inside, subject to budding habitats. We've heretofore discussed Titan's hydrocarbon lakes and possible cryovolcano."

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