Explanation: Sometimes it's night on the ground but day in the air. As the Earth rotates to eclipse the Sun, sunset rises up from the ground. Therefore, at sunset on the ground, sunlight still shines on clouds above. Under usual circumstances, a pretty sunset might be visible, but unusual noctilucent clouds float so high up they can be seen well after dark. Pictured above last month, a network of noctilucent clouds cast a colorful but eerie glow after dusk near Vallentuna, Sweden. Although noctilucent clouds are thought to be composed of small ice-coated particles, much remains unknown about them. Recent evidence indicates that at least some noctilucent clouds result from freezing water exhaust from Space Shuttles.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Publikacii s klyuchevymi slovami: noctilucent clouds - Sweden - Serebristye oblaka - atmosfera Zemli - atmosfernye yavleniya Publikacii so slovami: noctilucent clouds - Sweden - Serebristye oblaka - atmosfera Zemli - atmosfernye yavleniya
Sm. takzhe: STIV: siyayushaya reka nad Franciei Serebristye oblaka nad Floridoi Stolby sveta nad Vnutrennei Mongoliei Yuvyaskulya na nebe Snezhnaya burya 1938 goda v Verhnem Michigane "STIV" i Mlechnyi Put' peresekayutsya nad sel'skoi dorogoi Svechenie neba nad Franciei Vse publikacii na tu zhe temu >>