This was too good to pass up. Iapetus is mysterious for many reasons, including the ridge around the middle that makes it look like a walnut (not too visible in this picture). Scientists are mystified by the odd coloration on the right side of the picture. To me it’s obvious: The moon is moving left to right, it’s springtime on Saturn. Those are bug splats. Click the picture to enlarge.Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA
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