Connection Between Ancient Mass Extinctions and Nearby Supernova Explosions

What happened: Researchers from Keele University discovered that two significant extinction events, which resulted in the loss of up to 70% of species 372 and 445 million years ago, were probably triggered by supernova explosions near Earth that damaged the ozone layer. Should we worry: Presently, only two stars, Antares and Betelgeuse, with the potential to go supernova are situated over 500 light-years away. According to computer simulations, they are too distant to pose a threat to Earth.