The Northern Lights (Aurora Borealis) occur when charged particles from the sun are diverted by the Earth's magnetic field (magnetosphere) and collide with elements in the atmosphere, releasing different colors of light for different elements. The earth's magnetosphere has protected the atmosphere from being stripped of important life giving elements and also diverts charged particles to the poles. Perhaps you could say that the presence of a magnetosphere and hence an aurora are probably a precondition for complex surface life. The aurora are beautiful, ever changing, unpredictable, dynamic and filling the sky will leave you in awe. Of course it sometimes gets a little chilly, one night it got down to minus 37 degrees Celsius (almost the same in Fahrenheit).
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