http://apod.nasa.gov/apod/ap110328.html
Time-Lapse Auroras Over Norway
So, Norway is very lucky to get to experience all these auroras. I have done many-a post about auroras in the past. They're quite inspiring. Many times the auroras are green, as high energy particles strike the Earth's atmosphere, causing the air to glow as electrons recombine with their oxygen hosts. Other colors are occasionally noticeable as atmospheric nitrogen also becomes affected. In later sequences the Moon and rising stars are also visible. This time lapse was sweeeettt.
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