A powerful supernova some 1.9 billion light-years away rocked the universe, sending out a massive burst of gamma rays that buffeted our humble planet.
"The ozone was partially depleted - was destroyed temporarily," Pietro Ubertini, an astronomer at the National Institute of Astrophysics in Rome, coauthor of a new paper published in the journal Nature, told the newspaper.
Using simulations, scientists have previously concluded that a GRB in our own galaxy could fully wipe out our planet's ozone layer for years, triggering a devastating extinction event.
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