View Single Post
Feb29-12, 06:41 AM
Drakkith's Avatar
P: 11,904
The core of the sun, and stars similar to the sun, cannot bring fresh hydrogen from their outer layers into the core to replace the fused hydrogen. Thus whatever amount is in the fusible area of the core is all that it has to work with. Once this is used up the Sun will turn into a Red giant and begin burning Helium for a while.