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What name is given to the reddish-orange electrical discharges that occur high above active thunderstorm clouds?

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Correct answer: Sprites

Sprites are cold plasma phenomena that occur high in the mesosphere, up to 90 kilometers above a storm. They often look like giant reddish jellyfish and are rarely visible to the naked eye from the ground because they are blocked by the storm clouds. Photo: Matthew Dominick, Wikimedia Commons, Public domain.

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Source: Wikipedia (CC BY-SA)

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