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What causes the northern lights? | DW Documentary

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The northern lights, also known as the aurora borealis, are a light phenomenon that occur in the northern polar region. The aurora is caused by cosmic rays. The rays causing the aurora borealis have also had a significant effect on the evolution of life on Earth, but they bear a threat. How do these rays impact our climate? And what are the consequences for life on Earth? We don’t see or feel them and yet they surround us all the time. Particles from outer space constantly hurtle into our atmosphere. The low-energy cosmic rays of the sun produce one of...
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