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Do all auroras occur in circles?
Aurora Borealis: A Brief Overview (U.S. National Park Service)
What Are the Northern Lights? - Aurora Hunter
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Auroras in US: What is an Aurora? What's the time and best place to see?
Why do Auroras only occur in polar regions? - Astronomy Stack Exchange
PPT - Aurora borealis: Rainbows of the night PowerPoint Presentation