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They’re a little cagey about exactly where the crossover point lies relative to the likelihood of devastating effects on the planet.
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Wikipedia (Near-Earth Supernova) says that a 25 ly away supernova would wipe out half the ozone layer so that’s probably the lower bound for what we want
Geez, how many stars do we have that close to us?
Explanation for anyone who wants it: https://explainxkcd.com/wiki/index.php/2878:_Supernova
Astronomer on a planet just a little too close: “This is a cool way to die”
