hydrogen atoms join to form helium. no hydrogen= red giant=white dwarf= DEAD
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At the core where the fuel is burning
There is no fire in the sun, that is a chemical process. The process in the core is thermonuclear fusion.
Fusion reactions decrease the overall number of particles in the core, causing the core to shrink, converting gravitational potential energy into thermal energy, and increasing the rate of fusion.
The primary source of the sun's energy is nuclear fusion. This process occurs in the sun's core, where hydrogen atoms combine to form helium, releasing vast amounts of energy in the form of light and heat.
For nuclear fusion.
nuclear fusion reactions at the core of sun
The Sun's core is not yet hot enough, or under enough pressure, for helium fusion. Which is probably just as well, since when helium fusion begins, the Sun will swell into a red giant which will incinerate the Earth.
The helium in the Sun's core does not undergo fusion because it primarily consists of helium-4, which is a product of hydrogen fusion. While temperatures and pressures in the core are extremely high, the conditions required for helium fusion—such as even higher temperatures (around 100 million Kelvin) and sufficient density—are not met until much of the hydrogen has been fused into helium. Helium fusion, known as the triple-alpha process, will occur later in the Sun’s life cycle, once it exhausts its hydrogen fuel.
Increase in the core temperature and decrease in the core radius.
Energy is produced in the sun's core through nuclear fusion, where hydrogen atoms combine to form helium, releasing a tremendous amount of energy in the process. The high temperatures and pressures in the core of the sun provide the conditions necessary for nuclear fusion to occur.