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The term near-Earth supernova refers to a supernova sufficiently near that it affects Earth. The sufficiently-close distance is cited as 10-300 parsecs: (I'm not sure if this range of distances depends upon varying analysis of what a supernova might do, versus that it depends upon the strength of the supernova.) Statistics are that roughly 20 supernovae have occurred within 300 parsecs within the last 11 million years, and typically one happens within 10 parsecs on average every 240 million years. Eight stars within 300 parsecs are candidates for such a supernova, including Rigel and Betelgeuse.