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Noctilucent Couds-July 2, 2005

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Uploaded by on Jul 17, 2008

A time-lapse showing the east to west motion of high-altitude noctilucent clouds, also known as polar stratospheric clouds, strange cirrus-like clouds that exist some 80 km up near the edge of the atmosphere and that are visible only around summer solstice at high latitudes. © 2005 Alan Dyer

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