Why does the sun always shine?

Because the sun is extremely rich in hydrogen, under the high temperature (15 million degrees Celsius) and high pressure conditions in the center of the sun, these hydrogen nuclei interact with each other and combine to form helium nuclei, releasing a large amount of light and heat at the same time.

What happens on the sun is not the burning process that most people think. The thermonuclear reaction of hydrogen into helium that takes place inside the sun is the source of the sun's enormous energy. The hydrogen consumed by this thermonuclear reaction is extremely abundant on the sun.

The hydrogen stored on the sun will at least supply the sun to continue to shine as brilliantly as it does for 5 billion years! Even if all the hydrogen on the sun is burned, there will be other thermonuclear reactions that will continue to emit the sun with its huge amount of light and heat!

The sun is a red-hot gas planet that shines on its own. The temperature on its surface is about 6,000 degrees Celsius, and the core temperature is as high as 15 million degrees Celsius. The radius of the Sun is about 696,000 kilometers, which is about 109 times the radius of the Earth.

Its mass is tons, which is about 332,000 times that of the Earth. The average density of the Sun is grams per cubic centimeter, which is about 1 4 of the density of the Earth. The average distance between the Sun and our Earth is about 100 million kilometers.

The structure of the sun is mainly divided from the inside to the outside: the center is the thermonuclear reaction zone, the core is the radiation layer, the radiation layer is the troposphere, and the troposphere is the solar atmosphere outside the troposphere.

According to the theory of nuclear physics, the center of the sun is a thermonuclear reaction zone. The central region of the Sun occupies 1 4 of the entire radius of the Sun and is more than half of the mass of the entire Sun. This indicates that the density of matter in the central region of the Sun is very high.

Up to 160 grams per cubic centimeter. Under the attraction of the sun's own strong gravity, the central region of the sun is in a state of high density, high temperature and high pressure. It is the birthplace of the sun's immense energy.

The energy generated in the central region of the Sun is mainly transmitted in the form of radiation. Beyond the central region of the sun is the radiant layer, which extends from the radius of the sun at the top of the thermonuclear center to the radius of the sun, where the temperature, density, and pressure decrease from the inside out. In terms of volume, the radiant layer accounts for the vast majority of the total volume of the Sun.

Through thermonuclear fusion, the Sun emits light by burning a large amount of hydrogen concentrated at its core, which consumes an average of 600 per second

10,000 tons of hydrogen. After another 5 billion years of burning like this, 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 be as high as 1

more than 100 million degrees, leading to the occurrence of helium fusion...

This is because the nuclear fusion reaction inside the sun can release a huge amount of energy.

There are many hydrogen nuclei in the sun, which interact with each other and combine to form helium nuclei, which emits light and heat at the same time, which is called thermonuclear reaction, and the sun is a furnace that uses atoms as fuel. One kilogram of atomic fuel is worth 3 billion kilograms of coal. As long as a little bit of mass is converted into energy, the value is huge.

For example, the energy corresponding to 1 gram of matter is equivalent to the heat released by the combustion of 10,000 tons of coal.

The sun is mainly made up of hydrogen, which accounts for more than 70% of the mass. Under the conditions of high temperature (above 10 million K) and high pressure (about 250 billion atmospheres) in the interior of the sun, hydrogen atoms undergo a "thermonuclear reaction", which combines four hydrogen nuclei into one helium nucleus. In this reaction, a portion of the mass is converted into energy, releasing a large amount of heat.

Thermonuclear reactions inside the sun, similar to a hydrogen bomb on the ground**. It is precisely because of the countless "hydrogen bomb" processes that continue to occur in the core area of the sun, so the light and heat radiated by the sun are continuously eliminated. Atomic energy is the energy of the sun.

About 6 million tons of hydrogen fuse into helium every second, emitting a large amount of energy, and its surface humidity reaches more than 6,000 degrees Celsius, emitting intense sunlight.

The process of nuclear fusion (hydrogen fusion into helium) inside the sun emits light and heat.

The hydrogen atom fuses at high temperature into a helium atom and its mass decreases.

The mass-energy equation e=m c2. So a lot of energy is released.

As long as it is a substance, then it is exchanging energy (heat radiation, heat convection, heat transfer) with the surroundings at any time, among them, thermal radiation is emitting energy in the form of electromagnetic waves, and according to the different frequencies of electromagnetic waves, the amount of energy it transmits is also different, which also determines the different energy sources of the ground.

The reason why the sun shines is that it is also a source of energy, a powerful source of energy. Non-stop nuclear transformation. Energy is emitted at different frequencies.

We humans can see the sun because our eyes can react conditioned to one of the various frequencies of electromagnetic waves emitted by the sun.

Whatever it is, it glows.

There are many convertible hydrogen atoms inside the sun, which fuse into helium atoms, and during the fusion process, a lot of energy is released and volatilized through various activities of the sun. (In simple terms, nuclear fusion changes).

I've also seen it because the particles in the sun are very fast.

In the interior of the sun, four hydrogen atoms fuse and shrink into a helium atom, releasing a huge amount of energy, which is light and heat.

The sun uses nuclear fusion to generate light, and when two very light nuclei meet at high temperatures (such as helium and hydrogen), they synthesize new nuclei and release enormous amounts of energy.

Because the sun is a ball full of gas, its mass is large, so the internal pressure is also large, and after nuclear fusion, the gas that makes up the sun releases a huge amount of energy, accompanied by luminescence, heat, and radiation.

Because if the sun doesn't shine, it can't shine! So only the sun shines!

A large amount of heat released by nuclear fusion inside the sun.

50 percent of the energy radiated to the outside world by electromagnetic waves is concentrated in the visible light.

So you can see the sun glowing.

The sun shines because it produces excess energy in the process of hydrogen fusion into helium, which is eventually released in the form of light and heat, which is the real reason why the sun shines.

The Sun is a giant nuclear fusion reactor (nuclear fusion is a nuclear reaction in which two lighter nuclei combine to form a heavier nucleus and a very light nucleus or particle. In this process, the nuclear fusion reaction converts the mass of some of the reactants into energy), and the artificial sun mimics the sun's nuclear fusion principle to provide humans with an inexhaustible source of energy.

In terms of technical classification, artificial suns belong to controlled nuclear fusion, and the energy output process of nuclear fusion is artificially controlled to ensure that the energy output meets the dynamic demand for energy of human beings. The quantum effect helps the sun burn slowly, which is the secret of the sun's longevity. The Sun is large, not only in size, but also accounts for 99% of the total mass of the solar system.

However, the solar energy burns for so long, not because it ***. Conversely, the greater the mass, the greater the stellar gravitational pull, the more intense the star burns, and the faster the hydrogen depletion inside the star. As a result, massive stars have very short lifespans, and some of these short-lived stars have a lifespan of less than a million years.

However, the mass of the sun is not great in the universe.

The mass volume of the Sun

The Sun is a huge, red-hot planet of gas. Knowing the distance between the Sun and the Earth, and then measuring the diameter of the angle of view of the sun's circle from the earth, we can find that the radius of the sun is 10,000 kilometers, which is 109 times the radius of the earth. From this, it can be calculated that the volume of the Sun is 1.3 million times that of the Earth.

According to Kepler's third law of planetary motion, astronomers can also calculate that the mass of the Sun is kilograms, which is 330,000 times that of the Earth, using the mass of the Earth and the radius and period of its orbit around the Sun. And concentrates the mass of the solar system.

From the volume and mass of the Sun, it can be calculated that the average density of the Sun is gram cm3, which is about a multiple of the average density of the Earth. The gravitational acceleration on the surface of the Sun is equal to 2 meters and seconds, which is about 28 times the acceleration of gravity on the Earth's surface, and if a person were standing on the surface of the Sun, he would weigh 20 times as much as he would be on Earth.

The above content refers to Encyclopedia - Sun.

The sun shines because the thermonuclear reaction of hydrogen fusion into helium is going on inside the sun.

The Sun, which is mainly composed of hydrogen, has been able to shine steadily for billions of years because of the thermonuclear reaction of hydrogen fusion into helium that has been going on inside it. We can think of the fusion reaction inside the sun as a constant hydrogen bomb going on**. Every second, 600 million tons of hydrogen in the sun's core fuse into helium, converting nearly 4 million tons of matter into energy.

More specifically, in the interior of the Sun, protons fuse into helium-4 nuclei through a series of reactions, releasing energy. It is a fusion process known as a proton-proton chain, and in this process, positrons, gamma rays, and neutrinos are also released. Theories suggest that 99% of the sun's energy is released through a series of fusion reactions in the PP chain.

The longevity of the sun

Everything has a life cycle, and the sun is no exception. It is only compared to the evolutionary history of the sun that human history is only a drop in the ocean, and the sun that rises in the east and sets in the west every day will be mistaken for eternal change.

Based on a comparison of the existing hydrogen and helium levels in the sun, scientists have calculated that the sun will continue to "burn" for about another 5 billion years. At that point, the outer layer of the Sun will expand very large and become a giant red giant. Those planets that are close to it, such as Mercury, Venus, and even the Earth will be engulfed by this "big red fat man".

The Sun's life lasts millions more years during the Sunset Red phase, but once the Sun fuses the heaviest element it can fuse, its outer atmosphere will eventually disperse to form a magnificent planetary nebula, and its core will transform into a compact object, a white dwarf.

The above content reference: China Science Network - Sun, Here We Come: China's first comprehensive solar exploration satellite will be launched next year.