This is because the sun has been under control of nuclear fusion, and this controlled mechanism is gravity-constrained nuclear fusion. Of course, people on earth cannot imitate the huge pressure like the sun, so they can only find another way.

Some people say that the sun has been nuclear fusion , why doesn’t it explode? This is because the sun has been under control of nuclear fusion, and this controlled mechanism is gravity-constrained nuclear fusion.

The controlled nuclear fusion that humans are studying is based on the principle of solar nuclear fusion. Of course, people on earth cannot imitate the huge pressure like the sun, so they can only find another way. The controlled nuclear fusion method adopted by humans is high temperature excitation of 100 million degrees, using magnetic constraints, gravity field constraints, and inertial constraints.

high temperature excitation core fusion has been achieved, and the use of magnetic constraints has made good progress, but the binding force cannot last long, and there is still a long way to go before actual commercial application.

The controlled sun is a natural gravity-constrained nuclear fusion.

Its center temperature is 15 million degrees, and the pressure is 300 billion atmospheric pressure. The temperature of 15 million degrees is not enough to ignite nuclear fusion, so the reason why it triggers nuclear fusion is this huge pressure of 300 billion.

Under strong pressure, the extranuclear electrons of the hydrogen atom have escaped from the nucleus . The nucleus finally meets together and fusion begins. Nuclear fusion at the center of the sun is fusion from 4 hydrogen nuclei to one helium nucleus and releases huge energy.

Sun core 600 million tons of hydrogen are converted into 596 million tons of helium per second, and about 4 million tons of hydrogen are converted into light and heat, releasing energy of 3.8×10^26 J per second, diffusing into space in electromagnetic radiation, the earth thus obtaining one-2 billion of its energy.

Don’t underestimate the energy of one-billionth of 2 billion. It is equivalent to 40 million tons of TNT equivalent , which is the energy of 2,000 Hiroshima atomic bombs exploded every second. It is also equivalent to the power generation power of 10 million Three Gorges Dam. The combined power generated by all power stations in the world is not as good as this.

This pressure is formed by the central gravity caused by the sun mass .

The diameter of the sun is 1.392 million kilometers. Such a huge ball, due to the huge gravity of the center, collapses inward, forming a huge pressure. This pressure leads to the occurrence of nuclear fusion. At the same time, the huge energy tension generated by nuclear fusion offsets this huge gravitational pressure, which puts the sun, the huge plasma fireball, in a state of equilibrium, which is the star's main sequence star state.

The nuclear fusion of the sun is concentrated in the center of the sun under the constraints of this powerful gravitational field, and has been underway for 5 billion years.

After calculation, there is still a reaction cycle of 5 billion years. The hydrogen in the center of the sun will react completely, the tension will weaken, the center will shrink, and eventually collapse into an white dwarf the size of the earth.

. The matter outside the sun is weakened due to the weakening of the sun's gravity, and will diffuse into an red giant , with a volume exceeding the earth's orbit. Finally, the peripheral matter will float to space and become a secondary nebula. The sun ended his life and died.

The controlled nuclear fusion of the sun is just a metaphor, but it is actually a natural law and is not transferred by human will.

All stars in the universe follow this law. However, the speed of nuclear fusion reactions of stars of different masses also determine the lifetime of different stars.

Generally speaking, the larger the mass, the faster the nuclear fusion reaction speed, the faster the material consumed and the shorter the lifespan; conversely, the smaller the mass, the longer the lifespan of the star.

The lifespan of large stars is only a few million years short, and the lifespan of red dwarf is hundreds of billions or even trillions of years long, and lives with the universe.

. Yellow dwarfs like the sun generally have a lifespan of about 10 billion years.

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