There are some errors in that story. Betelgeuse is not the "second biggest star in the universe" - it's very, very large, a red super-giant, but there
are several much larger stars
that we know of (and probably countless more that we
don't yet know about).
An interesting thing they don't mention in the article, which may or may not be related to the star's possible impending supernova, observations over
the past 15 years have shown that it has lost about 15% of its diameter in that time. This could just be some sort of natural "breathing" of the star
and not mean anything, or it could mean it's going through some early stage of the process of actually blowing up soon.
edit on 1/19/2011 by LifeInDeath because: (no reason given)