Why will the sun get hot in 500 million years?

After 500 million years, the sun will not change significantly. In 500 million years, however, the Sun will expand violently, expanding 100 times in diameter to reach near the Earth's orbit. Devouring Mercury and Venus, even if the Earth survives, life will not survive.

At this time, the Sun changed from a main-sequence star to a red giant.

Why is this happening? When the internal temperature of the star reaches 15 million K, it will trigger thermonuclear fusion of hydrogen, which will emit light and heat. Such a stage in stellar evolution becomes the main-sequence star, which is the main stage in the life of stars, and our sun is also in such a stage.

For a celestial body the size of the Sun, after 10 billion years of main-sequence star phase, the internal problem will increase to 20 million K, at which point it will trigger thermonuclear fusion of helium, and the center of the star will change dramatically not in hydrogen, but in helium. The large amount of energy emitted will greatly extrapolate the surface of the star. At this stage, the Sun evolves into a giant star.

We already know the radius of the Earth's orbit of 100 million kilometers, and it is easy to calculate the circumference. According to the formula s=200 million, about 100 million kilometers. The rotation of the sun is due to gravity, while the orbit is unchanged.

Because the power inside the star has been steadily increasing since its birth.

Yes, in 5 billion years, the sun's lifespan will come to an end.

Any star has a lifespan, and a yellow dwarf like the Sun has a lifespan of about 10 billion years. Now the sun has been burning for 5 billion years, and it is in middle age.

In about 5 billion years, the Sun will enter old age and expand into a red giant star with a radius larger than the current orbital radius of the Earth, engulfing the Earth, Venus, Mercury, etc. Then, the hot gas in the outer outer layer of the sun will gradually disappear into space, leaving only a hot stellar nucleus, called a white dwarf. The Earth may be torn apart (roasted) by the hot Sun, or it may reappear after the Sun becomes a white dwarf.

But at that time, the earth was already unrecognizable, and there was no trace of water, atmosphere, or life.

But this situation is not at all a concern for humans today, because that will be billions of years away. Humanity may have been extinct before that, or had migrated to an alien planet.

The sun expands.

How long has human civilization been until now, and considering what will happen in 200 million 500 million years, it is quite good to be able to reproduce for 18 million years.

Any cosmic body has a lifespan, including the Earth. So don't worry too much, trust that human wisdom can solve it, such as moving to other planets.

These are nothing more than rhetorical speculations, and there is no actual data to prove what will happen billions of years from now. Just like the "Noah's Ark" in Western countries 5,000 years ago, no one has been able to confirm whether it really happened. There are also many mysteries of "reincarnation" in Buddhism that cannot be explained to this day, and we have not yet been able to see through them with current technology, so we can only listen to them as myths.

What will happen to the Sun in 5 billion years?

In another 5 billion years, we will see an impressive spectacle in our solar system – our sun will expand and become a red giant, engulfing all the planets in our solar system, including Earth. When the Sun expands sharply, it becomes more luminous, but after a year the Sun expands again, but it quickly fades to about 1,1000 of its current brightness, and becomes almost invisible until it begins to shrink again. In this way, the Sun merges into a variable star cluster in the form of a whale constellation, often referred to as a red giant.

While astronomers have known for centuries that some stars are dramatically changing their brightness, the nature of these changes in brightness has long been unclear. Later, two researchers decided to solve the mystery, believing that the formation of light-absorbing chemicals in the star's atmosphere, which are often used as sunscreen creams, was a key factor. Many variable stars change their brightness in a small area due to pulsating energy, and at the same time become sometimes hotter and sometimes colder.

However, the change in brightness of a variable star can be explained no more than 50 times using such a pulsation theory, and the striking brightness change observed in the variable stars of the whale constellation cannot be explained by a single pulsation theory.

In 1933, it was proposed that in the atmosphere of variable stars (when they expand and cool), metal oxide molecules are formed that absorb the light of the star, thus eclipsing the star. The two researchers realized that molecules in the form of titanium oxides, which are commonly used in sunscreen creams, can significantly enhance the opacity of the star's atmosphere, with the result that light from the star's interior and hot regions is absorbed, and only light from the star's exterior and cooling regions is seen. At greater distances, the temperature also drops, forming silicate dust and graphite dust.

Indeed, dust clouds have been observed around some variable stars in the constellation Whales, which can also block out the star's light, further weakening the star's luminescence.

There is no oxygen when the sun goes to work, and the combustion of the sun is different from our usual combustion, and the sun goes to work without oxygen, and the heat is actually due to nuclear fusion.

Because the interior of the sun is always going on nuclear fission, nuclear fusion, all the time burning, all the time producing energy.

This is because the sun is huge, and the sun is a huge sphere, so it can't burn out.

To answer this question, we must first understand the principle of the sun. The burning of the sun is not the same as burning in the ordinary sense. Most of the combustion we come into contact with in our lives is the combination of combustibles and oxygen, which undergoes a violent oxidation reaction and is accompanied by the release of heat.

And the combustion of the sun does not belong to the category of chemical reactions, but to nuclear reactions, that is, light nuclear fusion. The principle is that two hydrogen atoms fuse into one helium atom under high temperature and high pressure conditions, and the mass of the helium atom after fusion in the process of nuclear reaction is less than the mass of two hydrogen atoms, that is to say, the nuclear reaction does not follow the law of conservation of mass, and the disappearing mass will become energy released, the mass-energy equation e=mc2, e represents energy, m represents mass, and c represents the speed of light (constant, c =. Presented by Albert Einstein.

This equation is mainly used to explain the mass loss in nuclear transformation reactions and to calculate the energy of particles in high-energy physics. This is how the sun shines and heats.

The energy released in the nuclear reaction is huge, but the conditions required for the nuclear fusion reaction are also very harsh, and it must be formed under high temperature and high pressure conditions, for example, the hydrogen bomb must be detonated with an atomic bomb, so why can the sun continue to burn like this? In fact, the sun contains all the elements known to man, but the vast majority of them are made up of hydrogen. When enough hydrogen gas gathers together, due to gravity, the molecules attract each other, and the gas collapses to the middle, and there is heat generation in the process of gas collapse, and when enough gas gathers and produces a high enough temperature, nuclear fusion occurs.

Nuclear fusion releases enormous amounts of energy, mainly in the form of light and heat. The heat in turn expands the gas, and when the force of the gas collapse and the force of expansion reach a balance, the sun tends to stabilize.

So back to the question, how long can the sun burn? The amount of hydrogen on the sun is constant, and over time, there will be less and less hydrogen and more and more helium, and when the hydrogen burns out, the first round of combustion of the sun is over, of course, it will take hundreds of millions of years. Scientists estimate that the life span of the sun is about 10 billion years, and until now, the sun has been burning for more than four billion years, and the sun is now in its prime, that is, there are still more than five billion years to go.

But when the hydrogen atoms burn out, the sun will not go out. Because at that time, the main component of the sun is helium, helium will also collapse to the center, and it will still produce high temperature and pressure, when it reaches a certain temperature and pressure, helium will also undergo fusion reaction and become a new substance, and at that time, the sun will enter a new round of combustion.

The burning of the sun should not be a chemical reaction, but a nuclear reaction, so it is different from the combustion we understand, because the sun can burn for 5 billion years.

The burning of the sun is different from the combustion we imagine, the volume of the sun is very large, fission something, and it is inexhaustible.

Because the sun's ability to illuminate is very strong, and it also contains many rich substances, this situation will occur.

Because the volume of the Sun is 1.3 million times that of the Earth. The interior of the sun has been undergoing nuclear fusion, and it has been burning for 5 billion years now, and it is only half of the burning of Jane, and it will continue to burn for billions of years in the future. Kuan Sakura.

Because the sun has a lot of fuel, and a lot of material is produced through nuclear fusion, which can make the sun burn for many years.