Turns out the range at which a supernova could destroy a planet's ozone layer has increased from 50 light years to 160.
(I touch on this in my story "The Unrelenting Brilliance Of Day")
But don't worry, we're not all going to die: There are no potential supernovae within the danger zone. Phewf.
(The Earth has, though, been hit before, and it may have accelerated the evolution of life).
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