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Surprise high rise in the skies.

They're called "noctilucent clouds". Strange clouds at the edge of space, not where "normal" clouds are.


Above: Noctilucent clouds photographed by the crew of the ISS: more.

Here's the NASA article: http://science.nasa.gov/headlines/y2008/25aug_nlc.htm

And another great photo of them:


Above: Noctilucent clouds over Mt. Sabalan, a 15,784 ft extinct volcano in northwestern Iran. Photo credit: Siamak Sabet. [more ]
 
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