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Night-shining clouds

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Night-shining clouds

Night-shining clouds

Night-shining "noctilucent" clouds shine with light made blue by ozone absorption in the uppermost atmosphere, while the lower atmosphere glows red in deep twilight. Photographed from an airplane at 11.8 km over western Canada. 
[Honorable mention 2013 After Image photo contest.] —Joseph A. Shaw, Montana State University

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