Noctilucent clouds

Noctilucent clouds

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Caption: Noctilucent clouds. These bright displays are seen in the middle of the night in summer at high latitudes. Their composition is unknown, but they are known to exist at 70-90 kilometres altitude - well above normal clouds. They are normally seen when the sun is 4-16 degrees below the observer's horizon, and have a whitish colour against a dark sky. Photographed in Finland.

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Keywords: climate, cloud, cloud types, clouds, dusk, meteorology, night, noctilucent, noctilucent cloud, sky, weather

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