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Mètode's whys and wherefores: Why do auroras occur?
A Physicist Explains The Shimmering Science Behind Auroras - Science Friday
Aurora Borealis January 25, 2012 - The Canadian Nature Photorapher
Chasing The Northern Lights: Everything You Need To Know
Finally: Aurora Borealis in the mountains | Stefan Rieger – Landscape
Aurora: Types of Aurora
Why do Auroras only occur in polar regions? - Astronomy Stack Exchange
Science behind the formation of auroras - YouTube