Aurora Borealis (Revontulet), the northern polar light. When the particles of the solar wind hit the atmosphere of the Earth, the oxygen of the air flares in a greenish light. This natural phenomena occurs particularly near the Poles area. Thanks kiraffi.
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A 1 luokka (1st Class) irregular shape of the Finnish flag stamp was used. It was sent from Kuopio on 10.6.2009.
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