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... Auroras, also known as northern and southern (polar) lights or aurorae (singular: aurora), are natural light displays in the sky, particularly in the polar regions, and usually observed at night. They typically ... the ionosphere. They are also referred to as polar auroras. This is a misnomer however, because they ... Antarctic circles. Aurorae do occur deeper inside the polar regions, but these are infrequent and often invisible ...
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