The solar energy is generated in the inner core of sun by nuclear fusion where hydrogen isotopes fuse together to form helium nuclei. This process is associated with the release of greater amount of energy.
Nuclear fusion is the process of fusing of two light nuclei to form a heavy nuclei. Whereas, breaking of a heavy unstable radioactive isotope is called nuclear fission. Both nuclear processes release tremendous energy.
The source of heat and light energy in sun and other stars is nuclear fusion in their core. Sun and stars are abundant in hydrogen gas. One protons and deuteron fuses together to form a helium nuclei.
This process repeats for major part of the hydrogen gas present in stars make them globes of fire and heat. Fusion takes place in the inner core of these stars. That is inside the chromosphere.
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_Fe + _H₂SO₄ -> Fe₂ (SO₄)₃ _ H₂