STAR COLLAPSE. “The nuclear fusion reactions in the core of a star exhibit a dynamical behavior in the structure constitution as well as evolution of astrophysical objects. The fusion processes in the star core generate outward directed thermal pressure to overcome the gravitational pull produced by a star mass. Once the nuclear fuel is entirely burnt out, there remains no sufficient pressure to resist the attractive force of gravity, consequently, the star experiences the stellar death, a phenomenon known as gravitational collapse.”
https://www.sciencedirect.com/science/article/pii/S0577907319309773