Nacreous Clouds

Nacreous cloudsThese mother-of-pearl coloured clouds are known as nacreous clouds. They are formed under extreme conditions in the troposphere where temperatures drop to a low of minus 80 degrees Celsius and wind speed reaches 230 km/h. These are rare occurrences and occur only during sunset. Beautiful isn’t it?

Link: Boing Boing
Image: Paul A Newman / NASA
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