Green Aura - Aurora Borealis, Poster

Northern Lights Poster: This is an image of a green aura in the night sky; the aurora borealis. The aurora borealis is also called the northern lights, because it is only visible in the North sky from the Northern Hemisphere. The aurora borealis occurs mostly in the months of September to October and March to April. It is caused by the collision of charged electrons in the atmosphere of the Earth.

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