coondoggie writes "NASA said today its AIM satellite has provided the first global-scale, full-season view of iridescent polar clouds that form 50 miles above Earth's surface known as "Night-Shining" clouds. Night Shining clouds form at a high altitude which lets them reflect sunlight long after the sun has set. According to NASA, little is known about these clouds at the edge of space, also called Polar Mesospheric Clouds. The clouds consist of ice crystals formed when water vapor condenses onto dust particles in these coldest regions of the planet, at temperatures that may dip to minus 210 to minus 235 degrees F.
http://www.networkworld.com/community/node/22856" Link to Original Source
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