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hydrogen mainly, but there undergo fission to form helium (which undergo fission as the star approaches supernova producing the heavy elements like carbon)
Neclear Fusion because stars are powered by that, even our sun
The energy of the Sun is produced by nuclear fusion - the fusion of hydrogen into helium.
Yes, the higher the heat and pressure the heaver the elements that can be fused (until nickel & iron are the products, then no additional amount of heat and pressure can cause more fusion).
In nuclear fusion, energy is released when atoms are combined or fused together to form a larger atom. This is how the sun produces energy. In nuclear fission, atoms are split apart to form smaller atoms, releasing energy. In nuclear power plants nuclear fission is used to produce electricity.
BUT
Hydrogen is turned into helium in the fusion process that releases the Sun's energy.
The energy source for stars, which produces vast amounts of heat and light, is the fusion of atomic nuclei in the star's core. In our own Sun, hydrogen is fused into helium; in older and heavier stars heavier elements may also undergo nuclear fusion.
As an outcome of nuclear fusion of sun light elements ofDeuteriumand tritium
I think it's our Sun which gets heavier elements from fusion of hydrogen and other light elements.Edit: Our Sun does create helium from hydrogen by fusion, but that's all. The reason it has heavier elements is that these come from the nebula that formed the Sun. The heavier elements are thought to have come from stars that exploded as "supernovas", a long time ago.
Our sun produces mostly helium by fusion, but it also uses fusion to make lithium, beryllium and boron. Temperature and mass determine how far a star can go with fusion. "Solar fusion" only refers to the fusion going on in Sol, the star nearest Earth (our star, the sun). Stellar nucleosynthesis is how elements are produced in stars, and in much larger & hotter stars fusion is responsible for elements as heavy as unstable zinc, or stable iron.
hydrogen mainly, but there undergo fission to form helium (which undergo fission as the star approaches supernova producing the heavy elements like carbon)
The sun (mostly hydrogen) is basically a nuclear fusion reactor, releasing energy by nuclear fusion of hydrogen nuclei into higher elements (which is where the higher elements actually come from). In fact it is a fusion bomb held together by stupendous gravity. No hydrogen, no sun, no people.
Fusion only, there are no heavy elements like uranium so there can be no fission taking place
The prime energy producer in the Sun is the fusion of hydrogen to form helium, which occurs at a solar-core temperature of 14 million kelvin.As a star uses up most of its hydrogen, it begins to synthesize heavier elements. The more massive stars undergo a violent supernova at the end of its life, a process known as supernova nucleosynthesis. Our sun will not do this at the end of its' life. It will form a red dwarf instead.
Nuclear fusion.
That is called "nuclear fusion".