The only thing left at this point is a core ... burning through its hydrogen. Once a big star fuses its helium to carbon, it then burns through this heavier element, fusing it into neon. It then ...

At some point when the sun reaches the tip of the AGB [the asymptotic giant branch], helium burning will commence. In a star like the sun, helium burning occurs by thermal pulses. In each pulse ...

Eventually, the density reached a point where something ... The Sun is very much a main sequence star, in the G-type category (G2V to be precise). It’s been fusing hydrogen for 4.6 billion ...

The only thing left at this point is a core ... burning through its hydrogen. Once a big star fuses its helium to carbon, it then burns through this heavier element, fusing it into neon. It then ...