Respuesta :
Nuclear fusion and gravitational contraction are two energy sources help a star maintain equilibrium in its internal thermal pressure.
What is Nuclear fusion?
A reaction known as nuclear fusion occurs when two or more atomic nuclei fuse to create new atomic and subatomic particles (neutrons or protons). Energy is released or absorbed depending on how much mass there is between the reactants and products. The difference in nuclear binding energy between the atomic nuclei before and after the reaction is what causes this mass difference. Large amounts of energy are generated during nuclear fusion, which fuels active stars, main sequence stars, and other high-magnitude stars.
Energy is often released during nuclear fusion processes that result in atomic nuclei lighter than iron-56 or nickel-62. These substances have a comparatively low mass and a high nucleon binding energy.
To learn more about Nuclear fusion from the given link:
brainly.com/question/12701636
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