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After 50,000 years a rare green comet passes Earth again


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During the Stone Age, faraway Comet ZTF (C/2022 E3) began falling toward the inner solar system. The billions of years old comet finally reached Earth, only 0.28 AU away. 

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 The orbital period of the comet is 50,000 years according to NASA's Jet Propulsion Laboratory, meaning It hasn't been so close to Earth for 50,000 years since the last ice age and prior to the extinction of the Neanderthals.

 

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