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Everything is fine until a critical point is reached when the supply of available hydrogen begins to run out for Betelgeuse, At that point there is more helium than hydrogen within the star and energy production begins to decrease.
Once this happens, the relentless crushing forces of gravity momentarily gain the upper hand and begins to once more compress the material of the star towards it's center.
Originally posted by Mayura
...This scientific explanation is lame, as usual. Merely a fail safe.
Originally posted by tauristercus
We've recently had a thread stating that some scientists believe that Betelgeuse is possibly on the verge of going nova.