Source - NASA Science News for June 7, 2013
Noctilucent clouds have surprised researchers by appearing early this year. The unexpected apparition of electric-blue night-shining clouds hints at a change in the "teleconnections" of Earth's atmosphere.
The complete article can be found here: http://science.nasa.gov/
A companion video is posted below and can also be viewed at: http://www.youtube.com/watch?
License: Standard YouTube License
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