it fusions
That would be nuclear fusion, like what happens in stars, when two hydrogen nuclei combine to form a helium nucleus.
No, a fission reaction is not necessary to trigger a fusion reaction, but for us on earth, it is. In the field of nuclear weapons, a fission bomb is needed to create the heat necessary to set off a fusion weapon. We have to use fission, or, rather, the energy created by that, to initiate the fusion reaction. It might be possible to use a high power source, like a laser, on a small amount of material to get fusion to occur. But we are still experimenting with this in the Tokamak, and it's far from being a done deal. Stars are, in general, massive nuclear fusion reactors. Their constant consumption of fuel powering their high rate of fusion creates a massive amount of energy, and the stars' huge gravity keeps this process from blowing the whole thing apart. No fission is needed to sustain this reaction.
A nuclear reaction does not involve the breaking or forming of chemical bonds between atoms. Instead, it involves changes in the nucleus of atoms, such as nuclear fission or fusion. Additionally, a nuclear reaction does not typically release energy through the rearrangement of electrons in an atom's outer shell like a chemical reaction does.
In the so-called "hydrogen bomb" or fusion bomb, yes, there is energy released from the same reaction (hydrogen fusing to helium) as in the Sun.However, many if not most atomic bombs are fission bombs that do not involve fusion. In a fission bomb, the nuclei of uranium atoms are split, converting some of their mass to energy.All current fusion bombs include fission reactions to trigger the greater energy release from fusion. But most of the energy in very large fission-fusion bombs comes from a third-stage reaction: the fusion causes an exceptionally powerful fission reaction in a uranium shell around the bomb. This called a Teller-Ulam device or fission-fusion-fission bomb.
One likely product of a fusion reaction is helium, which is formed when hydrogen isotopes like deuterium and tritium fuse together. Energy is also released during this process, which can potentially be harnessed for power generation in technologies like nuclear fusion reactors.
The Sun, like other stars similar to it, is sustained by a Nuclear Fusion Reaction at its core. Unlike Nuclear Power here on Earth, which is created by the process of splitting atoms (Nuclear Fission) Fusion creates energy by fusing atoms together. This has proven a difficult objective to achieve here on Earth - though it occurs naturally in stars, on Earth the problem is containment, a problem that has as yet not found a viable solution. Though the extreme gravity of stars is what initiates a fusion reaction in them, it has been theorized recently that a fusion reaction at smaller levels with chemicals is possible. This is commonly referred to as "Cold Fusion" for the relatively low amount of energy it would produce in contrast to nuclear fusion. Though Cold Fusion has largely been discounted, it continues to be researched. Often the biggest scientific breakthroughs are made by those who do not always hold to conventional scientific beliefs. If we did, we would have never done things like go to the Moon, or broken the Sound Barrier. In the time before it happened, both were considered by mainstream science as "impossible" to achieve.
The Chernobyl disaster involved a nuclear fission reaction. Fission is the process of splitting atoms to release energy, which is the fundamental reaction in nuclear power plants like the one at Chernobyl. Fusion, on the other hand, involves joining atoms together to release energy and is the process that powers the sun.
In stars, the primary nuclear reaction is nuclear fusion, where lighter atomic nuclei combine to form heavier nuclei, releasing vast amounts of energy. The most common fusion process in stars like the Sun is the conversion of hydrogen into helium through a series of reactions known as the proton-proton chain. This reaction releases energy in the form of light and heat, which powers the star and contributes to the processes that sustain life on Earth. In more massive stars, other fusion processes can occur, including the fusion of helium into heavier elements.
Nuclear fusion is most commonly found in stars like our Sun. These stars heat up and create energy through nuclear fusion in their cores by fusing hydrogen atoms into helium. Nuclear fusion is also being studied for potential energy production on Earth through initiatives like nuclear fusion reactors.
The stars produce their heat from nuclear fusion reactions. Work on earth to produce controllable nuclear fusion is concentrating on one particular reaction, between deuterium and tritium, because it is the easiest to get going (though hard enough!). Stars operate with other reactions but all of the nuclear fusion type. You can read more in Wikipedia 'Nuclear fusion'
The nuclear process that converts helium and hydrogen into heavier elements is nuclear fusion. In this process, the nuclei of lighter elements combine to form the nuclei of heavier elements, releasing large amounts of energy in the process. This is the process that powers stars like our Sun.
In a star, nuclear fusion occurs in multiple stages. The main sequence stars, like our sun, primarily fuse hydrogen into helium in their cores through the proton-proton chain reaction. As the star evolves, it can go on to fuse heavier elements like carbon, oxygen, and eventually iron through various nuclear reactions.