Iapetus, the third largest of the more than 60 moons of Saturn, with one side almost totally black and the other white. It is walnut-shaped, with a ridge that is about 15 kilometers high, and 50 kilometers wide

 
Iapetus, the third largest of the more than 60 moons of Saturn, with one side almost totally black and the other white. It is walnut-shaped, with a ridge that is about 15 kilometers high, and 50 kilometers wide

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