Betelgeuse will NOT do this. In fact there's a chance that the star may have already gone nova we just won't know about it because we see it like it was about 650 years ago.
http://www.earthsky.org/radioshows/48792/betelgeuse-could-become-supernova
Schaefer said that even if Betelgeuse became a supernova, it would be too far away to do us any actual harm.
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