What Causes the Northern Lights?

The northern lights (aurora borealis) are a beautiful and mysterious force of nature, but what causes them?
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Thoughty2 (Arran) is a British YouTuber and gatekeeper of useless facts. Thoughty2 creates mind-blowing factual videos, on the weirdest, wackiest and most interesting topics. Combining fascinating lists with answers to life's biggest questions.