Mother Of Pearl

Polar stratospheric or nacreous clouds last Christmas.
Due to their altitude of 15,000–25,000 m (49,000–82,000 ft) and the curvature of the Earth's surface, these clouds shine brightly before dawn or after dusk. Consisting of ice crystals, these form below −78°C (−108°F) and are now more common outside of the polar regions due to global warming.

#Fife, eastern #Scotland.

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