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True fact: Hubble telescope spots ZOMBIES in SPACE

cray74

Most types of supernovae are only dangerous to Earth's ecosystem at distances under 26 light-years. A type II supernova at 26 light-years would knock out about half the ozone layer by producing some stratospheric nitrous oxides with its radiation.

I'm not sure what value you put in Wikipedia, but it has a nice summary of the threat and past events, plus a crunchy bibliography on the topic.

http://en.wikipedia.org/wiki/Near-Earth_supernova

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