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Night-shining Clouds

By: P-M Heden

 

Region: Europe

Site: Vallentuna - Sweden

 

As seen on National Geographic News the Noctilucent or night-shining clouds (NLCs) in a clear summer evening of Sweden. NLCs lie near the edge of space, reflecting sunlight from about 80 kilometers above Earth's surface. They are usually spotted above the Polar Regions in summer, as seen in this summer-time image from Sweden. P-M Heden/Clearskies.se.

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