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I looked into this. From what I can tell, Betelguese isn't close enough to do any major damage when it goes nova, but you will be seeing a third (the first two being the sun and moon) stellar object in the daytime sky...closer to the ending of 2010: The Year We Make Contact (or that one episode of Futurama) than Star Wars.
Either way, there had better not be any neutrinos screwing with our DNA, because if things go well with my girlfriend, she wants to have a family and I'd prefer our kids be human.
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