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What Causes The Northern Lights? Scientists Finally Know For Sure

The northern lights (aurora borealis) illuminate the sky over Reinfjorden in Reine, on Lofoten Islands in the Arctic Circle in 2017. (AFP via Getty Images)
The northern lights (aurora borealis) illuminate the sky over Reinfjorden in Reine, on Lofoten Islands in the Arctic Circle in 2017. (AFP via Getty Images)

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