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Aurora borealis
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Aurora borealis
Aurora borealis or northern lights display. Aurorae are caused by the interaction between energetic charged particles from the Sun and gas molecules in the upper atmosphere of the Earth, about 100 kilometres up. A stream of charged particles, called the solar wind, flows out into space continuously from the Sun at speeds of 400-500 kilometres per second. On reaching Earth, the charged particles are drawn by Earths magnetic field to the poles, where they collide with gas molecules in the upper atmosphere, causing them to emit light. Photographed from north Finland
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Activity Atmospheric Phenomenon Aurora Borealis Display Finland Magnetosphere Night Sky Northern Lights Polar Poles Scandinavia Silhouette Silhouetted Solar Wind Stars Weather
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