PICTURES: "Night Shining" Clouds Getting Brighter

PICTURES:
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Once seen mostly in the Arctic, night-shining clouds are now appearing more frequently at lower latitudes, including the above clouds photographed in Hungary on June 15, 2007.

The wispy clouds form in cold, dry conditions: Temperatures high in the atmosphere are well below -200 degrees Fahrenheit (-129 degrees Celsius), and the air is a million times drier than the Sahara, AIM's Russell said.
— Photograph courtesy Veres Viktor via NASA
 
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