Iapetus
MOON · orbits Saturn
The two faced moon. One half of Iapetus is as dark as coal, the other as bright as snow, and for centuries nobody knew why. Dark dust from the outer moon Phoebe drifts inward and coats Iapetus' leading side, and the warmed dark areas then lose their ice. As a bonus mystery, a ridge of mountains runs exactly along its equator, like a walnut's seam.
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