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Noctilucent clouds

From STUDY FINDS SPACE SHUTTLE EXHAUST CREATES NIGHT-SHINING CLOUDS http://www.nasa.gov/centers/goddard/news/topstory/2003/0522shuttleshine.html

Because of their high altitude, near the edge of space, noctilucent clouds shine at night when the Sun's rays hit them from below while the lower atmosphere is bathed in darkness. They typically form in the cold, summer polar mesosphere and are made of water ice crystals. Credit: Naval Research Laboratory, Washington, D.C.

Uploaded by Piotr Flatau

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