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Noctilucent Clouds Over Sweden
<< Yesterday 18.07.2006 Tomorrow >>
Noctilucent Clouds Over Sweden
Credit & Copyright: P-M HedIn
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.

Russkii tekst
Based on Astronomy Picture Of the Day
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
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