Have you ever heard of "noctilucent clouds"? Apparently they're quite a mystery. First observed in the 19th century, in the aftermath of the eruption of Krakatoa, they are much higher than everyday clouds, on the very edge of space, in fact. If you want to more, there's a good piece from NASA, which the blog Watt's Up With That pointed me to. Either way, you ought to check out this gorgeous photo gallery of noctilucent clouds, where I got the image above.
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