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Noctilucent Clouds

Rare phenomenon where clouds form in the mesosphere (50 miles up). They are only visible when the sun is below the horizon and the lower atmosphere is in the Ea...
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Rare phenomenon where clouds form in the mesosphere (50 miles up). They are only visible when the sun is below the horizon and the lower atmosphere is in the Earth's shadow. Occurs in 40-60 degrees latitude. This was taken June 2019.
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