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Ordinary stars maintain their spherical shape because the heaving gravity of their gigantic mass tries to pull their gas toward a central point, but is balanced by the energy from nuclear fusion in their cores, which exerts an outward pressure

The neutron stars are the smallest but heaviest density supergiant star. The surfaces of the neutron stars undergo thermonuclear fusion to produce energy to survive.

What is thermonuclear fusion?

Thermonuclear fusion or just simply nuclear fusion is a nuclear reaction that involves the combining (fusion) of the atomic nuclei together to produce different nuclei in the presence of high temperatures.

Unlike nuclear fission, it needs high temperature and energy to produce atomic nuclei. It is a process generally seen in the universe including the Sun, stars, galaxies, etc.

Neutron stars also use their energy to undergo thermonuclear fusion and produce heavy nuclei from lighter nuclei. The hydrogen atom combines fuses to form helium atoms resulting in high energy production.

Therefore, neutron stars generate energy by thermonuclear fusion.

Learn more about thermonuclear fusion here:

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