Distant star explosions could have wiped out life on Earth twice

9 months ago 9
A star exploding in a supernova

Most people know the theory that an asteroid smashed into Earth — hitting what is now the Yucatán Peninsula — and killed off many of the dinosaurs about 66 million years ago. 

But that was not the only mass extinction for the planet — just the most well-known. Scientists believe at least five mass extinctions have occurred in the past 500 million years, and not all of them were caused by menacing

Source: https://mashable.com/article/supernova-mass-extinctions-earth

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