Did a supernova reason Earth’s mass extinction 360 million years in the past?

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One of the worst extinction events in Earth’s history may have been triggered by a supernova, the violent death of a distant star.

About 75% of all species on Earth died out at the end of the Devonian Period, nearly 360 million years ago. Rocks from this era preserve many thousands of spores that appear to be scorched by ultraviolet (UV) radiation, indicating that something went seriously wrong with our protective ozone layer.



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