For the sake of being interesting and vivid, I have said a lot of things related to the theme, which is a little verbose.
Stars fuse from the simplest hydrogen, helium, carbon, and oxygen to neon, magnesium, silicon, and iron during fusion energy release. Finally, the core of a star as small as the sun collapses into a white dwarf, and the outer shell becomes a giant star or even a nebula; slightly larger stars The iron core collapses into a neutron star, and the outer layers explode into a nebula, where elements heavier than iron form; larger stars become black holes.
As for why the fusion to iron stops, it is because the fusion of elements lighter than iron releases energy and the fission release energy of elements heavier than iron. When the energy is released, the core of the star can resist the huge gravity without collapsing. When it reaches the iron, there is no energy source, the star will collapse suddenly, and the stellar material will be smashed to the core at the speed of light. This process will have a "rebound effect", the stellar material will spin upward, resulting in a supernova explosion. After the explosion, the core becomes a neutron star, and the outer shell becomes a nebula, which may assemble into new stars or planets. Therefore, the solar system is the remnant of the supernova explosion, and human beings themselves are also the remnants of the supernova.
I remember reading related books in high school, so I explained Xingxing's life like this in a weekly diary, which made the Chinese teacher look bewildered.
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