Noctilucent Clouds
Observations, Frequency & Linkage to Climate Change. Noctilucent Clouds. Noctilucent Clouds taken from 36,000 feet above the South of Nunivak Island, Alaska on June 20, 2006. Image credit: John Boardman. http://www.nasa.gov/mission_pages/aim/multimedia/nocticulant_clouds.html.
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