http://news.nationalgeographic.com/news/2009/06/090610-betelgeuse-star-shrinking.html Famous Star Is Shrinking, Puzzling Astronomers Ker Than in Pasadena,...
Betelgeuse supernova would not be good for deep sky observers. Currently Betelgeuse shines at a -5.4 absolute magnitude. Typical supernova can peak at an...