ANSWERS: 1
  • According to the article cited below, 500 lightyears seems to be the critical distance for a supernova to cause mass extinction on earth: http://www.newscientist.com/article.ns?id=dn1764 No imminent candidate for going 'Boom' any time soon. Given the fact that the impact on earth would decrease only with the square of the distance, a supernova within a 1000 lightyears perimeter will certainly be noticable: a x-ray for all creatures small and large, then long, bright, sleepless nights.

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