Imagine you took a chunk of ice, sculpted it into a walnut shape, scored its surface by throwing rocks at it, and coated half of it with dirt in an oblong shape. What would you have? Well, if that chunk of ice was 1500 km in diameter and orbiting Saturn, you'd just about have Iapetus, Saturn's third-largest moon!
(image from NASA)
I wrote an article about freakish moon Iapetus on the A* forum; it's basically a brief summary of the Wikipedia article with fewer words, large in-line pictures, and more exclamation marks! Yesssss!
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