Thermonuclear fusion starts from the inside of the star, producing radiation pressure that can compete with gravity, so the outer shell of the celestial body is pushed out. Can be compared with the hot air balloon in daily life. Once the flame is ignited and the gas is heated, the whole shell will be pushed out. In addition, the stars listed by the landlord are all main sequence stars, and what happens inside is hydrogen nuclear fusion. If helium fusion is turned on inside, multi-layer thermonuclear fusion will be released, which will cause the star to expand rapidly again. For example, the diameter of the sun now is about 6.5438+0.3 million kilometers. Five billion years later, when the thermonuclear fusion of helium begins, Na will continue to expand by 654.38+000 times, which is close to devouring the earth (654.38+0.5 billion kilometers). The reason is the radiation pressure caused by the fusion of stars.

According to the current human cognition of life, it is impossible for stars to have life. Because the high temperature on the surface of the star is enough to ionize the electrons in the outer layer of the atom and form plasma. And all substances in our daily life are further combined by chemical bonds-that is, the interaction of outer electrons between atoms. On the surface of a star, because the outer electrons can be thermally ionized, there is naturally no life based on chemical bonds. Of course, some people have put forward a brand-new life model, such as electromagnetic life, which is not bound by chemical bonds, but so far, this is an interesting guess (far from the theory).