Mysteries of some atmospheric halos remain unexplained after 5,000 years

For the first time in nearly 5,000 years of observations, researchers have fully cataloged the optical illusions created in the sky when light shines through ice crystals known as atmospheric halos.

The Atmospheric Halos “Inventory” details commonly seen atmospheric optical illusions from known sources and sheds light on rarer halos, including those whose origins are currently a mystery.

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