“The ozone was partially depleted — was destroyed temporarily.”
–Statement by Pietro Ubertini, an astronomer at the National Institute of Astrophysics in Rome, regarding supernova gamma rays that hit the Earth’s upper atmosphere in October 2022. The supernova explosion was 1.9 billion light-years away. You can read the paper on this event in Nature. An earlier paper stated that a gamma ray burst may have caused the Ordovician mass extinction about 440 million years ago, which killed off about two-thirds of all species.
Our Awesome Universe 