2 suns ...

Wow if our astronomers are to be believed, that would be an incredible event. Betelgeuse one of the real big stars is going to be blow up (or we see the event now) - it would be a Supernova. Here is a news report on Betelgeuse blowing up

This star is really gigantic and hence it would blast as a supernova....and then probably become a neutron star or a black hole. See the size comparison of Betelgeuse with Earth or even Sun here

But when it could blow up is a question : It could be million years from now ? Or as recent as 2012 ? If we are seeing it blow up in 2012 then it should have actually exploded in 1400s as it is 600 odd light years away and that light is reaching earth just now....

Nonetheless just wondering how can they predict life cycle of a star. A star can live for millions (or perhaps billions??) of years...Then how can we predict its lifecycle ? We might have advancements in astronomy for the past 100 years but that's just a fraction of time. They might be using some simulations/ theoretical models...