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Image Of Noctilucent (Mesospheric) Clouds Taken On June 19, 2010 In Moscow At Railway Station. Noctilucent Clouds Are Tenuous Cloud-Like Phenomena That Are The Ragged-Edge Of A Much Brighter And Pervasive Polar Cloud Layer Called Polar Mesospheric Clouds In The Upper Atmosphere, Visible In A Deep Twilight. They Are Made Of Crystals Of Water Ice. The Name Means Roughly Night Shining In Latin.