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Extremely rare, black 'anti-auroras' paint luminous 'letter E' above Alaska

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Aurora hunter Todd Salat spotted the unusual aurora on Nov. 22 above an unspecified location in southcentral Alaska .

The luminous letter appeared seemingly out of nowhere and lasted for a few minutes .

Black aurora is the result of anti-auroras, a.k.a . black auroras.

Anti-aurora are essentially the opposite of an aurora and prevent gases from giving off energy in the form of light.