These are two pictures of Iapetus. Some parts of the moon's surface are bright white. Other areas are very dark. The Cassini spacecraft took these pictures.
Click on image for full size
Images courtesy of NASA/JPL/Space Science Institute.
The Surface of Iapetus
The surface of Iapetus is not like any other moon. No other moon looks half-black and half-white. It seems to be covered on the dark side with a mysterious black and smooth substance, and on its bright side appears to have many craters. Whatever caused this half-and-half look is a mystery to scientists.
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