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Hyperion is large irregularly-shaped moon of Saturn. It has unusual surface features and a very low density. Hyperion follows a highly eccentric orbit around Saturn that takes it close to Titan, largest of Saturn's moons. Strong interactions between Titan and Hyperion force the smaller moon to rotate chaotically. Accordingly, there is no way to predict the length of Hyperion's "day" or even the location of its spin axis far into the future.