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Northern lights over Europe and North America

The northern lights over Derwent water near Keswick, England, on March 17.

The northern lights over Derwent water near Keswick, England, on March 17.  (Owen Humphreys / Associated Press)

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The northern lights, also known as aurora borealis, are seen above Europe and North America. An aurora is a phenomenon where natural light, caused by charged particles, is displayed in the skies mainly over the Arctic and Antarctic regions.

Northern lights

The northern lights are seen north of Budapest, Hungary, on March 17.  (Balazs Mohai / Associated Press)

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