Why don't Stars Last Forever?

[Willem F Esterhuyse]

We have that some stars use the Carbon-Nitrogen cycle. Since this produces again the isotope it started with, why don't these type of stars last forever?

Edited November 29, 2022 by Willem F Esterhuyse

[swansont]

Those are catalysts for proton fusion, producing helium. Eventually you don’t have enough fuel for continued fusion in this process.

https://en.wikipedia.org/wiki/CNO_cycle

[Saber]

Because nothing in this  physical  world  lasts  forever
having a limited  lifetime is one of the  fundamentals of  being here in this world

 

I mean Time  is  one of the  fundamentals  and  elements  of this  physical  reality  we are in

And  you  know the  element  of time its self  means  that  the  things  that  ( time )  is  applied  on  are  not eternal
have you studied  the  false  vacuum theory ?

Edited January 14, 2023 by Saber

[iNow]

False vacuum like needless spaces btw words, right?

[exchemist]

6 hours ago, iNow said:

False vacuum like needless spaces btw words, right?

Hmm, I see what you mean.