The Sun's core is hotter, and at a higher pressure, than the outer layers. I assume there is a very small amount of fusion in the outer layers, but not enough to make a real difference.
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There is no fire in the sun, that is a chemical process. The process in the core is thermonuclear fusion.
Fusion occurs in the core of the sun and other stars.
Nuclear fusion occurs in the solar core.
The innermost layer of the sun is called the core. It is where nuclear fusion reactions occur, generating the energy that powers the sun's immense heat and light.
It has to be at hundreds of millions of degrees kelvin, before a fusion reaction between deuterium and tritium will start
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The core of the Sun is the layer that contains the densest material. It is where nuclear fusion reactions occur, resulting in high temperatures and pressures, which contribute to the density of the core.
Fusion occurs in the core of the Sun
The core
Hydrogen fusion does not occur in the corona of the sun. Fusion reactions occur in the sun's core where conditions are hot and dense enough for hydrogen nuclei to combine to form helium, releasing energy in the process. The corona is cooler and less dense than the core, so fusion cannot take place there.
In all stars, the fusion only occurs in the inner core.