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Shuttle Exhaust Tied to PMCs Over Scandinavia
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Shuttle Exhaust Tied to PMCs Over Scandinavia

December 12, 2012
Noctilucent clouds – also known as polar mesospheric clouds (PMCs) over Wismar, Germany on July 9, 2011. These clouds shine brightly even during the night. Shuttle exhaust made of water vapor formed particularly bright PMCs over Scandinavia. Credit: Leibniz-Institute of Atmospheric Physics