Methane Painting

Why does Saturn look like it’s been painted with a dark brush in this infrared image, but Dione looks untouched? via NASA http://www.nasa.gov/image-feature/jpl/cassini/pia18336/methane-painting

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Photo taken from Cassini probe. This is an infrared image. Can you answer this question why Dione looks untouched?

roygbiv1949

Little known jack of all trades.

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