It is very difficult to tell how massive a star
is when it becomes a red giant, and we do not know
the mass of Betelgeuse. Since life span of any
stage is dependent on mass, we therefore do not
Star death is not something that happens
rapidly except in the case of a supernova. As far
as I know, we do not have good methods of
predicting supernovae until we start seeing the
neutrino flux as the star actually begins
to explode. For less massive stars, it is not a
process that takes place over a time scale where
humans live long enough to see it.
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