Noctilucent clouds – also known as polar mesospheric clouds (PMCs) over Wismar, Germany on July 9, 2011.
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 PhysicsLink to associated news item