Please show the evolution of the star from birth to death in detail!!

The net reaction of hydrogen fusion in the core of a star, whether it is a p-p chain or a carbon-nitrogen-oxygen cycle, is to fuse four hydrogens into one helium, so the total amount of material in the core of the star gradually decreases. After each hydrogen fusion reaction, the resulting helium nuclei contribute as much to the pressure of the hydrogen nuclei as the hydrogen nuclei, but the total number of nuclei decreases, resulting in a slight decrease in air pressure, which is slightly compressed by gravitational pressure. As the core shrinks, the temperature of the core rises, the rate of hydrogen fusion increases, producing more radiant energy and the star becomes brighter.

The increased energy is transferred outward, causing the outer layers of the star to expand and the surface temperature to drop. Therefore, after entering the main sequence zone, the size of the star will increase slowly with the increase of star age, and the brightness will gradually increase, but the surface temperature will decrease.

When a star dies, it eventually becomes one of three things: a white dwarf, a neutron star, and a black hole.

If you want to become a white dwarf after death, the star must be a small and medium-sized star, and in the process of death, two parts are formed, the star shell and the star core, the star shell is ejected outward, the star core collapses inward, and if the mass of the star core is not greater than the mass of the sun, a white dwarf will be formed. When a white dwarf is under high pressure, the atoms are crushed, and the electrons will deorbit and become free electrons.

In general, the mass of such a star before death is about 8 to 10 times the mass of the Sun. According to theoretical speculation, white dwarfs make up about 10% of the total number of stars.

If a star wants to become a neutron star, then its mass must be more than 8 10 times the mass of the sun, and less than 30 times, so as to ensure that the star will have a supernova when it dies, and the mass of the inner core will remain between times the mass of the sun, and finally under high pressure, not only the atoms will be crushed, but the nucleus will also be crushed, and the protons and electrons will combine to form neutrons, and finally, all the neutrons will be compressed together to form a neutron star.

Stars that are twice as massive as the Sun die and become neutron stars, more than twice as massive as the Sun become black holes, and those smaller than the Sun become white dwarfs (including the Sun).

As the megamolecular cloud orbits a galaxy, events may cause its gravitational collapse to collapse. Macromolecular clouds may collide with each other or pass through dense parts of the spiral arms. The high-velocity mass thrown by a nearby supernova explosion is also a trigger.

Finally, nebulae compression and perturbations caused by galaxial collisions may also form a large number of stars.

The life of a star is, in order:

Common stars: stellar nebula - vertical spike star - main-sequence star - red giant star - ** (gravitational collapse) - white dwarf - black dwarf (extinguished).

Brown dwarf: Stellar nebula - protostar - brown dwarf - Chafinch black dwarf (extinguished).

Supermassive stars:

Stellar nebula – protostellar – main-sequence star – red giant star – red supergiant – ** (supernova explosion) – neutron star Black hole.

Ordinary stars refer to stars with a mass greater than one-tenth of the mass of the Sun to less than ten times the mass of the Sun, and have a very long lifespan, generally ranging from billions to more than 10 billion years.

Brown dwarfs are stars with a mass less than one-tenth of the mass of the Sun, unable to release energy by thermonuclear fusion, and have a very short lifespan.

Supermassive stars refer to stars with a mass greater than ten times the mass of Yu Buyang, and their lifespans are also very short, generally only tens of millions of years. In general, the more massive a star is, the shorter the lifespan. Stars that are typically less than 25 to 30 times the mass of the Sun become neutron stars after a supernova explosion, while stars with greater masses become black holes.

Because the energy of a larger star cannot counteract its gravitational pull, the star will collapse along a singularity to an infinite density and infinite mass, and the gravitational force will be so strong that even light (speed of light = 300000000 meters and seconds) cannot escape, forming a black hole. Smaller stars, similarly collapsing along a singularity, have a mass smaller than the mass of the Sun (if it is larger, it is a black hole), so they form white dwarfs or neutron stars (very massive).

a.The red giant Bi Hand Source Star.

b.Supernova.

c.Planet. d.Satellite.

Correct Answer: Hand A

Stars are one of the most magnificent beings in the universe, forming in dense clouds of gas, shrinking and densifying with gravity, eventually burning elements such as hydrogen and helium in their cores, producing dazzling light and heat. When the star's core runs out of fuel, gravity again gains the upper hand, and the pressure inside the star is not enough to resist gravity, causing the star's interior to begin to collapse and the temperature and pressure to rise at the same time. This process will cause the outer layers of the star to explode, releasing intense energy and matter that will form a beautiful nebula.

If the mass of the star is large enough, when the core collapses to a certain extent, it will enter a black hole state, becoming one of the most mysterious beings in the universe. For a star with a small positive mass epoch, when the core collapses to a certain extent, it will become a white dwarf, and gradually cool and dim, eventually becoming a permanent dark object.

The formation and death of stars is one of the most fundamental and important processes in the universe, and it is also one of the important ways for us to understand the historical evolution of the universe and the earth.

The formation and death of stars is one of the extremely important processes in the universe. Here's some basic information about star formation and death:

The process of star formation:

Constant splendor star formation usually occurs in a large molecular cloud. These molecular clouds contain gases and tiny dust particles that, due to gravity, gradually coalesce into larger clumps of matter, or voids, that eventually form stars.

When the substance condenses to a certain density, the temperature also increases. If the density is high enough, the substance reaches a temperature high enough to initiate a nuclear fusion reaction. These reactions produce a tremendous amount of energy and light that causes the star to start glowing and heating up.

The process by which the stars die:

When a star runs out of hydrogen fuel inside it, it starts burning other elements such as helium and carbon. The combustion of these different elements creates different shells inside the star and produces different reactions. In the process, the core of the star becomes hotter and hotter, and the burners become denser.

When the temperature of a star's core reaches a high enough temperature, it undergoes nuclear collapse. It is a violent reaction that compresses large amounts of matter into an extremely dense state in a very short period of time, forming black holes or neutron stars.

For smaller stars, they become white dwarfs after they burn out. It is a very dense object that gradually cools down and gradually stops emitting light due to the absence of fuel inside.

In conclusion, star formation and death are very important processes in the universe, and their evolution and characteristics are of great significance to the study of cosmology and astronomy.

Stars die as galaxies evolve, and when we talk about stars, we usually mean the main sequence phase of stars, that is, they are in the middle stage of nuclear fusion, and when this phase ends, stars of different masses evolve into white dwarfs, neutron stars, or black holes, but there is another type of star, which is the black dwarf. Typically, such stars are less than eight to ten times the mass of the Sun before they die. According to theory, white dwarfs make up about 10% of the total number of stars.

In order for a star to be a neutron star, it must be between 8 and 10 times the mass of the Sun and 30 times that of the Sun. In order for a star to be in a supernova at the time of death**, its core is kept between to times the mass of the Sun. Finally, under high pressure, not only the atoms, but also the nuclei are crushed.

Protons and electrons combine to form neutrons, and finally, all the neutrons are compressed together to form a neutron star. A neutron star is not the final state of a star; It can evolve further. When its energy is depleted, the neutron star turns into a black dwarf that does not emit light.

<> star dies and becomes a white dwarf, neutron star, or black hole, but there is a dark object that the star emits light, but their mass varies greatly, and the different characteristic masses of each star are also different. Equivalent to 8-50% of the mass of the Sun is a red dwarf, which is considered to be the minimum mass of a star, light and heat are not strong, and a star with a surface temperature between 2000-3500 degrees Celsius, that is, 50%-80% of the mass of the Sun, is an orange dwarf, which is stronger than a red dwarf, but not as strong as the Sun.

All living things in the universe cannot exist forever, and they all die one day, and stars are no exception, stars exist in three forms after death, and some even occur after death**, stars become white dwarfs, neutron stars, or black holes after they die, but there is a dark object, and the nuclear fusion process inside these two types of stars is very slow. Especially the red dwarf, its internal nuclear fusion time can be as long as thousands or trillions of years, and after the end of the internal nuclear fusion, the light and heat of these two stars will gradually fade, and nothing will happen, so this terminal planet will become a black dwarf, this kind of object is very dark, it does not emit light or heat, like an unknown black ball.

When a star dies, it becomes a neutron star, and if it is more than twice the mass of the Sun, it can become a black hole, and if it is smaller than the Sun, it becomes a white dwarf.

When a star dies, it becomes a bubble. We won't see the stars on our planet. The night of the earth will be dark.

When a star dies, it will slowly turn into a neutron star, a white dwarf, or a black hole, depending on the situation.