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Discussion Starter · #1 ·
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:

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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