Thursday, August 29, 2013
Tuesday, August 6, 2013
Noctilucent Clouds
Noctilucent Clouds are very high altitude clouds that are seen in between 50 and 70 degrees north and south of the equator. They are observed in the Summer months and when the Sun is below the horizon. Made up of crystals of water ice, they provide a spectacular show.
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| Pekka Parviainen |
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| NASA |
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