Auroras are actually collisions between electrically charged particles from the sun that enter the Earth's atmosphere.
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These lights are seen above the magnetic poles of the northern and southern hemispheres. They are called 'Aurora borealis' in the north and 'Aurora austral' in the south
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They are a beautiful show that nature offers, unfortunately it can not be seen all over the world
For more information about the Auroras, visit the following link