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Noctilucent clouds and waterlilies
Finland

The red band in the very edge of the visible noctilucent cloud is caused by optical absorption in the athmosphere and to some extent the ozone layer (the Sun shines thru the ozone into the cloud since ozone layer is under the noctilucent cloud in the athmosphere). Basically it's the Earth casting its shadow to the cloud.

There's a 1988 paper titled "The coloured edge of noctilucent clouds" that goes into further detail on the phenomenon.

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Copyright: Janne
Type: Spherical
Resolution: 11000x5500
Uploaded: 09/08/2011
Updated: 05/09/2014
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Tags: nlc; noctilucent clouds; night; summer; sky; clouds; nature; waterlilies; lake; water
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More About Finland

Finland is the jam. It came from an exploding egg, the egg of a water bird, the top half of which you can still see in the shape of the starry canopy that hangs over the earth.Finland is the most sparsely-populated country in the EU with only 5 million people. It's also been ranked the second most stable country in the world, after Norway.Historically, Finland has been a part of Sweden and later, Russia. It was an autonomous Grand Duchy during the Russian Empire's reign and lasted as such until their declaration of independence in 1917. Subsequently Finland survived a civil war and wars against both Russia and Nazi Germany to eventually settle down as an EU member circa 1955.Finnish language is cool, it's totally unrelated to the whole Latin-root thing. Its closest relative is Hungarian. Linguistic historians estimate that it came from northern central Russia from 3000BC.If you're in Helsinki, the museum at Suomenlinna has some interesting bunkers and military wreckage, including a submarine!Caught on camera! Here's your long-awaited proof. Santa Claus comes from Finland.Apart from Lappland, the other thing most people are familiar with out of Finland is aquavite. Literally it translates to "water of life" but it may make you feel more like you are dying when it hits your throat.Text by Steve Smith.