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The Northern Lights

On their way down towards the geomagnetic poles, the solar particles are stopped by Earth's atmosphere, which acts as an effective shield against these deadly particles.


When the solar particles are stopped by the atmosphere, they collide with the atmospheric gases present, and the collision energy between the solar particle and the gas molecule is emitted as a photon - a light particle.
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And when you have many such collisions, you have an aurora - lights that may seem to move across the sky.


Photo: John Eivind Karlsen