Noctilucent clouds

Noctilucent clouds

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Credit: PEKKA PARVIAINEN/SCIENCE PHOTO LIBRARY

Caption: Noctilucent clouds. These are extremely high altitude clouds (85 kilometres) that appear around polar regions and are believed to be composed of ice crystals. Their altitude allows them to reflect light at night, hence their name. But because of their height and location their formation is still not fully understood.

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Keywords: atmosphere, atmospheric phenomenon, climate, cloud, clouds, europe, finland, high altitude, lake, meteorological, meteorology, noctilucent cloud, reflected, reflection, scandinavia, silhouette, silhouetted, sky, trees, weather

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