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Noctilucent Cloud Sightings

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Published on Apr 13, 2007

Polar Mesospheric Clouds form during each polar region's summer months in the coldest place in the atmosphere -- 50 miles above the Earth's surface. Noctilucent Clouds were first observed in 1885 by an amateur astronomer and have been becoming brighter, more frequent and appear to be moving to lower latitudes in recent years. Credit: Hampton University (NASA)

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