Saturn's "Yin-Yang" moon Iapetus

Thanks to the Cassini mission, a great many things have been learned about the Saturn system in recent years. In addition to information on Saturn's atmosphere, rotation and its beautiful and extensive ring system, many revelations have been made about Saturn's system of moons. For example, very little was known about the obscure moon of Iapetus – sometimes nicknamed Saturn's "yin-yang" moon – before Cassini's arrival.

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