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Iapetus

Iapetus

This moon is half dark, and half light. The two areas wrap around each other like the two halves of a baseball. High-resolution images of the transition area allowed scientists to determine that the moon started out white, and got covered by a layer of reddish dust. The dust might have been blasted from Phoebe when it got hit by other objects.


Credit: NASA/JPL/Space Science Institute
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