Not nuclear, it takes an extremely hight temperature for Fusion to occur with in the sun or any other star.
ADDED: Yes "nuclear". Fusion is one of the two type of nuclear reaction, the other being Fission.
Fusion
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5/9/21
For nuclear fusion.
The corresponding white dwarf needs to reach a temperature for nuclear fusion to occur, which is about 20 million degrees kelvin.
fusion is called thermonuclear for a good reason: it needs a lot of heat to get started.
It is Exosphere
By thermonuclear fusion of hydrogen, producing helium. The same process that produces the energy in a hydrogen bomb (although the sun fuses far more hydrogen in the same period of time than the largest hydrogen bomb ever speculated would fuse during its entire explosion, thus producing more energy than such a bomb).
Because the conditions of temperature and pressure that occur in stars do not occur on earth
For nuclear fusion.
The dangerous condition that can occur in a nuclear reactor and due to overheating is a nuclear meltdown.
In areas of high temperature and high pressure
Fusion. Apex
fusion
No, normally it occurs at temperatures of millions of degrees. It does occur at room temperature, but not in significant amount; any possible practical use of "cold fusion" is, so far, speculation.
It is spontaneous, or it occurs on its own without any outside input. It may occur extremely slow or extremely fast, but it will occur without any outside input at the specified temperature.
Deformation occurs
The corresponding white dwarf needs to reach a temperature for nuclear fusion to occur, which is about 20 million degrees kelvin.
There are many ways a nuclear accident may occur, however most nuclear power plant accident occur due to problem in an reactor.
Nuclear fusion of light elements is the process operating in the stars to produce energy, and needs very high temperature to occur. Experiments on earth to aim at producing useful power from fusion have been progressing for many years. The reactants most likely to be used are isotopes of hydrogen, deuterium and tritium. These need to be heated to some hundreds of millions of degrees kelvin before reaction starts. Fusion reactions have been seen, but only for less than 1 second so far. Fusion is not a chemical reaction, it is a nuclear process.