Aurora colors: What causes them and why do they vary?
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The Colors of the Aurora (U.S. National Park Service)
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What Creates the Colors in the Northern Lights? - Causes of the
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Northern Lights: What are the aurorae borealis?
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Why the rare 'blood aurora' inspires awe – and foreboding
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The northern lights explained by scientists in Kiruna
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The Colors of the Aurora (U.S. National Park Service)
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The Vivid Lights: What Causes the Colour of the Aurora
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How to photograph the northern lights: Digital Photography Review
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Northern Lights: What Do They Really Look Like? - Life in Norway
What causes colour difference in auroras? - Quora
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Northern Light Fact #3 - The Color - Apukka Resort
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Aurora
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What is Aurora Borealis and what are Aurora Borealis colors