Let s talk a little bit about the stages of evolution that the sun has to go through and what its fi

The Sun and its planets were formed about 5 billion years ago by the gravitational contraction of clouds of interstellar matter. It has been suggested that since the Sun contains more heavy elements (e.g., iron) than many other stars, it can be inferred that the Sun is a second-generation star, i.e., a cloud of solar gas that contains embers that other stars emit into space after nuclear combustion. The current state of the sun has been maintained for about 5 billion years.

After it runs out of hydrogen fuel, it will be sustained by nuclear reactions of helium and other heavier elements. In the process, it will gradually transform from its current yellow dwarf stage to a red giant, and then to a red supergiant. After all nuclear energy is used up, there will be no energy inside the Sun to resist the gravitational collapse, which greatly reduces its radius and increases its density, so that its matter enters a degenerate electron gas state and becomes a white dwarf.

When it can no longer shrink, there will be no more energy to release, and its life will end, and it will become a cold "black dwarf" in a non-luminous, degenerate state, and its lifespan is estimated to be 10 billion years.

The landlord can take a look, the first of which is the evolution stage of the sun.

Evolution of the stars:

1.Interstellar gas - protostars--- main-sequence stars--- red giants--- white dwarfs--- black dwarfs (the evolution of the Sun).

2.Interstellar gas - protostellar --- main-sequence stars--- red giants--- supernovae explodes --- interstellar matter.

-Neutron star. -Black hole. mass more than 8 times the sun)

Hope it helps.

Modern observations suggest that the Sun is 5 billion years old. It is a typical intermediate-mass star that is smoothly burning its own nuclear reserves and converting hydrogen to helium. The evolution of stars is now being refined and the life course of the Sun is being outlined.

In the juvenile stage, the primitive nebula continued to shrink under its own gravitational pull, increasing its density and increasing temperature. It took tens of millions of years to form the primordial sun.

In its youth, the Sun is in a very stable main sequence (see "Stars"), and the observed abundance of hydrogen and helium estimates suggest that the Sun can live for up to 5 billion years. Today's sun is in its heyday.

The middle age stage, which lasts about 1 billion years. When the combustion circle of the thermonuclear reaction is close to half of the radius of the sun, it will be difficult to support the huge gravitational pull of the sun itself, and the center will collapse, and the huge energy released in the process of collapse will greatly expand the outer part of the sun, and the sun will be very large, very dense, and very bright on the surface, and evolve into a red giant. The diameter of the Sun will expand to 250 times its current size, and even the Earth will be swallowed up.

In old age, the Sun transforms into a pulsating variable star, and finally, the internal nuclear energy is exhausted, the whole collapses, and the interior is compressed into a very dense core, which cools down to form a white dwarf, which remains in the universe for a long time.

Nebulae – star formation – stars – red giants – supernovae – black holes.

To put it simply, the fate of stellar evolution is decay, which is divided into the following types. 1. Black holes. When a star dies, it collapses on its own, collapsing into a basketball-sized or smaller volume, and its massive mass creates a huge gravitational pull that attracts everything in the space around it.

2. Giant Storm Star. Some of the bridge-world stars have fissioned during their demise, increasing in size by 1.1 million macroswords, becoming super-large but very low-energy stellar remnants. 3. White dwarf sensitive limbs.

When it collapses properly, the energy is very low, and it is not even burning, but its density is also larger than that of ordinary stars, and although its gravitational force is smaller than that of a black hole, it is still 41,000 10,000 times larger than the original. 4. Direct violent annihilation. ** The path of the decline of a few stars, but this ** disease is not intense, after which the stars turn into cosmic dust.

5. Cooling. The energy of the stars burned out and gradually cooled, like briquettes that have extinguished their flames, dead and dead.

The Sun will evolve into a red giant star in 5 billion years, then a white dwarf, and finally a brown dwarf. The Sun is currently an energetic main-sequence star, and through thermonuclear fusion, the Sun emits light by burning large amounts of hydrogen concentrated at its core, consuming an average of 6 million tons of hydrogen per second. After another 5 billion years, the Sun will deplete its hydrogen reserves, and then the nuclear region will shrink and the nuclear reaction will expand to the outside, when its temperature can reach more than 100 million degrees, leading to helium fusion.

In the future, the Sun will expand dramatically, entering the so-called "red giant" stage, its brightness will increase to 100 times that of today, and swallow up its nearest planets such as Mercury and Venus, and the Earth will also be "scorched", and life will no longer be able to survive. Over time, the Sun will run out of all of its nuclear fuel faster and faster, enter its last years, and collapse into a faint white dwarf. On such white dwarfs, a matchbox-sized piece of material can reach about 1 ton.

White dwarfs do not have a nuclear reaction, they are the remnants left behind after the end of the stellar nuclear reaction, and they continue to radiate a small amount of energy by shrinking their size. In the end, the sun will become a "brown dwarf" with no light and no heat, disappearing into the depths of the vast universe, ending its glorious and ordinary life.

In about 5 billion years, our Sun will enter the end of its evolution and become a red giant. Its inner core will gradually shrink to become a white dwarf, while its outer shell will expand rapidly, reaching a diameter of almost 200 million kilometers.

The Sun will enter the red giant to white dwarf phase:

The planets that once orbited the sun have been ruthlessly torn apart and devoured by it. It is speculated that these planets should have fallen into white dwarfs after their previous stars expanded into red giants and ejected their shells completely into space. When the Sun enters the end of its evolution, entering the red giant or white dwarf phase, the four rocky planets on the inner side will face a life and death test.

The sun may end up swallowing the Earth:

The distance between the Earth and the Sun is about 100 million kilometers, and the Earth's orbit will definitely be swallowed by the Sun. As a result, the planet is likely to face an unprecedented crisis. If the earth had remained in this position, then it would have been swallowed up by the sun and reduced to ashes.

Of course, scientists also have a relatively optimistic expectation that the strong solar wind will push the Earth farther away, saving the Earth from being swallowed up. <>

According to the mainstream theory of astronomical evolution, a star of mass like the Sun will eventually become a white dwarf, that is, a dying star, which is very dense and extremely hot, but small in size (compared to a star that is envied in the prime of life), and finally its energy is exhausted, and it will gradually extinguish and become a black dwarf that does not emit light, which can be considered to be the grave of the sun.

The current Sun is in the main-sequence phase, that is, in the prime of life. In another four or five billion years, it will enter the unstable red giant stage, and its volume will begin to expand beyond the Earth's stupid cavity orbit, which means that the Earth will be swallowed up. Don't worry, humanity at that time would have had the perfect solution long ago and would leave the earth that nurtured us.

Then the sun will explode into a magnificent supernova --- the future, throwing out the outer gas shell, and compressing the interior into a white dwarf under a huge reaction.

This is the end-stage evolution of the sun. The evolution of stars with different masses at the end of the stellar period is different. To put it simply, stars with less than or equal to three solar masses will eventually become white dwarfs, just like the Sun; Stars with more than three solar masses will collapse into a black hole.

Original by my rich astronomical knowledge, never copy books, I hope you are satisfied.