Supernova Won't Destroy the World

[Fraser]

SUMMARY: Just in case you were worried, it appears that a supernova would have to be really really close to the Earth before it could cause massive damage to our environment. Scientists at NASA and Kansas University used data from a recent exploding star to determine that a supernova would have to be only 26 light-years away in order to strip away the ozone layer - an encounter that only happens once every 670 million years.

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[GOURDHEAD]

...a supernova would have to be only 26 light-years away in order to strip away the ozone layer - an encounter that only happens once every 670 million years. We don't seem to have had one in the last 3 or 4 billion years. How shall we be comforted?