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Well I didn't know about the red bits, so I did some digging and here's what I've learned. The whole image was taken by a NASA satellite imaging system, and the red bits are the part not in true color; those are where this particular imaging system has detected heat.
I have one other really cool (IMO) photo in the queue relating to volcanoes, but that is an image for another day. But I will keep an eye out for other Etna shots, as there much be a lot of them right now.
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