The rare types of wispy, blue-white clouds form when water molecules freeze around 'meteor smoke' close to the edge of space ...
http://news.discovery.com/earth/night-shining-clouds-come-early-over-s
The rare types of wispy, blue-white clouds form when water molecules freeze around 'meteor smoke' close to the edge of space ...
http://news.discovery.com/earth/night-shining-clouds-come-early-over-s
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