There is no high temperature or high pressure in the universe, so how does hydrogen fuse into stars?

Universal pressure causes hydrogen to attract each other, accumulate more and more, and form stars, and they are fused at very high temperatures and pressures inside the star.

Stars are gravitationally brought together slowly, and when they have a fairly large mass, nuclear fusion occurs inside.

Gravitational accumulation causes nuclear fusion to become stars.

Because of the gravitational pull, then the rotation compresses.

Hydrogen and hydrogen fall in love, and the more they get together, the more they get together. Eventually become a star.

Fusion is a nuclear reaction in which the result is the formation of new elements. The first time I heard that stars would spawn!

Computers are also gendered, test whether your home computer is male or female: click "Notepad" to create a new notepad file. Enter createobject("").

speak "i love you"The save extension is .VBS files such as: I love you.

vbs and then click on this file and you'll hear i love u. You can tell if your computer is male or female by sound.

The large water ratio in front of the bed is suspected to be in the water paste. Look up at the roof, keep your head down and continue the water.

Isn't there high pressure inside the star?

I think there are other elements that are not found to exist.

I think you should go to Guoke or Zhihu to ask this question.

The hydrogen mass revolves around the center, friction generates heat, the energy rises, and finally nuclear fusion occurs, and the star is lit up, which is the stellar nuclear ......

The Sun is located at the center of the solar system and is the main source of light and energy for the Earth. The eight planets, asteroids, meteoroids, and comets all revolve around this large fireball in their respective orbits. The surface composition of the sun includes hydrogen, helium, and traces of other elements such as iron, nickel, oxygen, silicon, sulfur, magnesium, carbon, neon, calcium, and chromium.

The Sun has a surface temperature of about 5,780 k(), and it is 11 cubic meters (149.6 million kilometers) from the Earth. Now, let's discuss the formation of this huge, hot star.

Although we don't find accurate information about the formation of the sun, it is thought that the sun formed 10 million years ago, 20 million years ago. According to astronomers, hydrogen on the surface of the Sun is produced along with the cosmic maximum. In other words, the sun and other substances in the universe are produced at about the same time.

When the universe is large**, hydrogen condenses to form huge clouds, and after that, the clouds gather to form a huge universe. Some of the hydrogen gas does not participate in the aggregation and floats in the universe.

Subsequently, for some reason, this free-floating hydrogen gas gathers to form the Sun and the Solar System. In general, we think that the precursor of the Sun and the solar system was a slowly rotating molecular cloud of hydrogen molecules, helium molecules, and dust. After that, the molecular cloud compresses due to its own gravity, and along with the compression process, the molecular cloud rotates faster.

The high-speed rotation of the molecular cloud eventually turns it into a giant disk.

The mass of the disk is mainly concentrated in the center, causing it to produce a gas ball in its center, which continuously attracts material from the disk, which causes the temperature and pressure inside the gas ball to increase, so that the atoms begin to combine in the center of the gas ball. This is the moment when the Sun is formed from the gas sphere, and the rest of the disk except the gas sphere forms the planets and the rest of the solar system.

The formation and evolution of the solar system and the evolution of starsThe present Sun is about half of its most stable part of its life, has not changed dramatically in the last four billion years, and will remain relatively stable for the next five billion years. However, after hydrogen fusion in its core stops, the sun undergoes drastic changes both inside and outside.

Hydrogen atoms and helium atoms in the universe collide and merge with each other due to mutual gravity, and when the energy gathers to a certain moment, these substances will be ignited instantly, triggering nuclear fusion.

Hydrogen and helium undergo nuclear fusion and nuclear fission reactions, and since hydrogen is the mother of all elements, hydrogen can be fissioned because helium can combine to form other elements, which can form other substances.

Hydrogen and helium undergo a reaction of nuclear fusion and nuclear fission. Therefore, hydrogen can be fissioned because it can combine with other elements to form other substances.

When the stars in the universe are formed, the raw materials consumed by nuclear fusion inside them are basically hydrogen elements, that is to say, stars start nuclear fusion from hydrogen and then shine and heat, and then the stars synthesize hydrogen into helium through nuclear fusion, and then synthesize lithium, so only hydrogen is not formed by stars, so what about the hydrogen element that provides the initial fusion raw materials for the star?

Hydrogen is the most primitive, simplest, and earliest element in the universe. Scientists believe that hydrogen accounts for more than 90% of the visible matter in the universe, and our sun has been formed for 5 billion years, but its nuclear fusion still burns hydrogen. Nowadays, we humans have discovered more than 100 elements, but their formation is basically based on hydrogen, which is a variety of elements formed by the fusion of layers of fusion on the basis of hydrogen.

In fact, almost all hydrogen in the universe comes from the beginning of the universe. The current astrophysical theory believes that the universe is formed by the singularity of the big **, in one second after the big **, various particles began to form, ten seconds later, the protons and neutrons in the nucleus also began to form, but it was not until 300,000 years later, when the temperature and pressure in the universe dropped low enough, hydrogen atoms began to form in large quantities, during this period, all the electrons, protons, and neutrons in the universe almost synthesized several light elements such as hydrogen, helium, and lithium, among which hydrogen was the most, followed by helium. The two accounted for about 98% of the initial material elements in the universe, so almost all the hydrogen elements in the universe came from that period, which provided enough raw materials for fusion combustion for the formation of stars in the later period.

Notice why does this say "almost all hydrogen" instead of "all hydrogen"? When two neutron stars collide, there will be a more violent ** than a supernova explosion, creating a high temperature of more than 300 billion degrees, and a large number of neutron star materials will be thrown out at this moment, which are basically neutron degenerate once they leave the high-temperature and high-pressure environment of neutron stars, neutrons will break away from the neutron degenerate state and become free neutrons, but the neutron state at this time is very unstable. After about 15 minutes, there will be a beta decay, that is, the neutron will release an electron, then it will be a proton, and at the same time they will also release an antineutrino, which is very small, and it is released in the form of energy, and when it goes out, it will drown and disappear together with the neutrino, forming a burst of energy.

It should be, after all, these large amounts of hydrogen are not naturally produced, they are all formed in the process of the cosmic star-making movement.

Yes, this substance is a good energy source, and it is very well used in our lives now.

Not necessarily, depending on the generations of stars. But it's not just hydrogen.

After the cosmic greatness, there were only two original elements in the universe, hydrogen and a small amount of helium. So the first generation of stars formed in the universe had only two elements, hydrogen and helium. Once the star is formed, the internal nuclear fusion reaction begins to take place, the amount of helium begins to rise, and the amount of hydrogen begins to decrease.

When helium also starts to undergo fusion reactions, carbon and so on appear. Since then, heavier elements have also appeared in massive stars. It wasn't until the first supernova exploded that all the elements in the periodic table appeared.

When these elements spread into the universe with supernova explosions, they mix with the original interstellar gas clouds to form the raw materials for the next generation of stars. So, starting with the second generation of stars, it was not just hydrogen and helium, but all the elements.

Hydrogen in a star is not oxidative combustion, but a fusion reaction of hydrogen fusion into helium nuclei.

At extremely high temperatures and pressures, the nuclei of hydrogen (i.e., protons) can coalesce in pairs to form the nucleus of helium. Since the mass of the four protons is about smaller than that of one helium nucleus, this part of the mass is converted into energy according to Einstein's e mc 2 and released in the form of light and heat, making it look like a star is burning violently. The reaction process is as follows:

This "combustion" process is completely different from the burning of hydrogen in oxygen on Earth. On Earth, the combustion of hydrogen in oxygen is an oxidation reaction of hydrogen, which emits much less energy than the fusion reaction of the hydrogen nucleus. And the nuclear reaction of hydrogen fusion to helium that takes place on a star does not require oxygen at all.

Because there is a sequence here, it is the universe that produces all the matter in the universe, and then the universe cools the hydrogen element to be produced, and the aggregation of matter leads to the occurrence of nuclear fusion, that is, it leads to the formation of stars.

How the universe came to be is still inconclusive, according to the observations of scientists can be determined that the beginning of the universe is hotter and denser than now, these conclusions are based on the cosmic microwave background (the change of the residual microwave environment after the universe is large and the observation of the current universe can draw the conclusion that the universe is cooling), the redshift phenomenon of the movement of galaxies (the redshift phenomenon is the luminescence or reflection of celestial bodies away from the earth at high speed, and the spectrum moves to the red light side, indicating that the matter of the universe is accelerating the separation) and so on.

After the universe was further cooled down, various microscopic particles that could be observed by humans today were gradually formed, and the microscopic particles were further combined to produce the main substance that constitutes the universe - hydrogen.

Gravity is an inherent property of matter, after the formation of lighter element atoms such as hydrogen, in the universe because of gravity gradually gather to form gaseous celestial bodies, in the process of material aggregation and collision, a lot of heat will be generated, plus the matter continues to gather and finally the internal pressure will be very large, super pressure and high temperature make the hydrogen nucleus have the energy to collide with each other, in the process of forming the nucleus of new elements, there is a partial mass loss, and the lost mass is converted into the amount of energy rock cover, and the first stars in the universe are formed, illuminating the universe.

The nuclear fusion activity of stars is also the place where new elements are generated, forming various heavy element atoms, and those atoms combine with each other to form solid Tianzi jujube bodies, and rocky planets are also formed.

Through experiments at the Large Hadron Collider, it can be known that when particles collide with each other at extremely high speeds, some element atoms will be dispersed into more basic microscopic particles. The existing universe is large**, and then there is the formation of hydrogen, and then the occurrence of nuclear fusion, the formation of stars and other celestial bodies.

As part of stellar nucleosynthesis, a variety of fusion reactions occur within the core depending on the mass and internal structure of the star. The net mass of the atoms after fusion will be slightly less than the sum of the atomic masses before fusion, and these lost masses are converted into energy according to the mass-energy equivalence relationship: e = mc.

The reaction of hydrogen fusion is extremely sensitive to temperature, so as long as there is a small change in the temperature of the core, the reaction rate will change significantly. The core temperature of main-sequence stars can range from 4 million K for the lowest mass M-type stars to 40 million K for the massive O-type stars.

In the same way, nuclear fusion reactions also have speed, the size of the star determines the speed of its nuclear reaction, the larger the star, the higher the pressure temperature of the center, the faster the nuclear reaction, even if the mass is large, its lifetime is much smaller than that of a small mass star.

First, hydrogen in stars is not in the form of hydrogen gas, but is completely ionized at high temperatures.

Secondly, the combustion reaction in a star is a nuclear reaction in a physical reaction, not a chemical reaction, a chemical reaction is that the molecules are separable, the atoms are inseparable, and the nuclear physical reaction is that even the atoms are broken. Hydrogen in the star In a high-temperature and high-pressure environment, four hydrogen atoms undergo a series of nuclear fusion reactions to form a helium nucleus. Nuclear fusion has 4% of its mass converted into energy.

Nuclear fission is 1%. ）

Thirdly, even combustion in a chemical reaction does not necessarily require oxygen. The conditions for combustion are: combustibles, combustibles (not oxygen), and the temperature reaches the ignition point.

In addition to oxygen (O2), there are fluorine gas (F2), chlorine (Cl2), ozone (O3), etc., and compounds such as hydrogen peroxide (H2O2), nitrogen tetroxide (N2O4), oxygen difluoride (O2), nitric acid (Hno3), etc. In addition, when it reacts with extremely reactive substances such as sodium and potassium, nitrogen (N2) and carbon dioxide (CO2) can also support combustion.