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Thanks for the info people. With 10000ly to 20000ly distance from the nearest potential supernova activity, we should be safe from any life threatening side effects. That's a relief, even if it's 20 millenniums in the future.
Further reading has reveled the Crab Nebula is the remnants of a supernova. Chinese records from 1054 show it's explosion was visible for months, even during the day. That would have been something to see.
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