Just though I'd pass thing along for morale...
These are noctilucent clouds. These are typically found above 35,000ft and higher. (Sometimes as high as 250,000ft!) They usually form in the mesopause from ice crystals.
Anybody else have any photos of noctilucent clouds or stories of them?
(Picture courtesy of Tom Eklund from Toijala, Finland)
Noctilucent clouds
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