Saturn’s moon Iapetus is half black and half white because its front side picks up space dust, some of which may have been shed by Saturn’s other moons, and its back side accumulates ice. The moon has looked like a walnut for a very long time. | Harper's Magazine

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Saturn’s moon Iapetus is half black and half white because its front side picks up space dust, some of which may have been shed by Saturn’s other moons, and its back side accumulates ice. The moon has looked like a walnut for a very long time.

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Saturn’s moon Iapetus is half black and half white because its front side picks up space dust, some of which may have been shed by Saturn’s other moons, and its back side accumulates ice. The moon has looked like a walnut for a very long time.

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