The temperature of the sun is as high as 5,000 degrees, so why is the universe still cold?

In fact, when the universe was first born, it was not cold, not only was it not cold, but it was also extremely hot, but the skyrocketing space quickly caused the temperature of the universe to drop to the level of matter formation! Of course, the skyrocketing has not stopped, and the universe is gradually cooling down, until now the cosmic microwave background radiation is about 3k.

From another point of view, the evolution of the universe is a process of gradual temperature reduction, so we can foresee that in the future, with the infinite expansion of the universe, the microwave background radiation temperature of the universe will drop to a lower level, of course, there is a bottom line, that is, absolute zero, that is, the temperature at which everything is stationary! But never get there!

But now there are still so many stars in our universe that are shining and heating, and the temperature of the universe has not risen to a very high level, which has to be understood from two perspectives, the first is that the entropy of our universe is constantly increasing, although there will be a decreasing process in a small area, such as unnecessary nebulae becoming ordered stars, but their final direction is disorder, because red dwarfs will never be able to form new objects! And this trend cannot be changed unless the universe collapses again!

Then the second is that although there are stars shining and heating, but the distance between the stars is too far, taking the sun as an example, the nearest star is light years away, if the two stars each manage their own acres and threes of land, then in the area of 2 light years, the solar radiation can be obtained is about 10 watts square meters, and the radiation power that can be obtained in orbit near our earth is about 16.5 billion times that of 2 light years away! But the temperature on Earth has not risen very high, which is mainly due to the loss of radiation into space!

In addition, there is no matter in the universe 2 light-years away that can receive sunlight, and the energy of light cannot convert to temperature, and space has no concept of temperature!

It should also be noted that this is only the distance near the sun, if it is universal to the universe, it is simply the volume of the observable universe (46.5 billion light-year radius) divided by the number of stars in the observable universe (2 trillion galaxies, 200 billion stars per galaxy), calculate the cosmic space evenly distributed by each star, and you can find that the nearest star will be averaged into the cosmic space with a radius of light years!

Most of the stars we can see are in these 1,200 light-years, and if we were averaged into the entire universe, we might not be able to see a single star in our field of vision!

The temperature is high, but there are certain limitations, but it is only a range, and it is impossible to cover the whole universe.

Because the universe is very large, the temperature produced by the sun is not enough to be distributed everywhere in the universe.

Although the temperature of the sun is very high, the universe is very big, very big, so it is still cold.

From a microscopic point of view, the temperature is mainly determined by the movement rate of elementary particles in a certain range, and the faster the particle moves, the higher the temperature. Temperature can also be conducted, but the conduction of temperature in a certain space also requires a medium like sound.

Because the space of the universe is still relatively large, it is difficult for the sun to shine in every corner.

Because space is in a near-vacuum state, its temperature is always kept near absolute zero. We all know that the reason why human beings have become the most blessed planet in the vast sea of stars in the universe today is largely thanks to the conscientious work of the sun for billions of years.

It is the sun's brilliance that gives life on earth the opportunity to thrive. Today, no matter how far human technology has come, it can only develop by relying on the breath of the sun. The surface of the sun is as high as 8,000 degrees, and the temperature of the inner core is more than five digits;

After passing 1.5 billion kilometers, sunlight can still make us feel very hot, and this is only a small part of the photons that the sun emits. It is conceivable that the entire solar system, most of which I am afraid will become very high on average under the influence of the sun.

However, to name a statistic, it may surprise many people. The average temperature in the interior of the solar system is minus 271 degrees Celsius, which is only two degrees Celsius away from absolute zero. In fact, the temperature of the sun is nothing compared to the real behemoths in the universe.

For example, the "galactic black hole" at the center of the Milky Way galaxy is 3.3 million times more massive than the Sun and has more than a million times the heat of the Sun. However, most corners of the universe still remain in a state very close to "absolute zero", which is the reason for this phenomenon;

Let's start with the nature of temperature. In fact, temperature is a kind of collision friction motion between particles, and the more frequent the activity of particles in space, the higher its temperature will rise; Otherwise, it will go down.

And space is basically a vacuum environment, so there is no place for "photons". So, even if we put a million, ten million suns in the universe, the places that should be cold are still very cold.

Because space is very large, and there are many stars and planets in space, as well as many neutron stars and black holes, the air quality inside is very poor, and the environment is very poor, so it can be close to such a temperature.

The Sun belongs to a star in the solar system, while other galaxies in space are far away from the solar system. So the heat of the sun does not warm the whole of space.

The sun's rays don't penetrate so much, so it's insignificant in space, and it can't dissipate this bit of heat.

Because there are very few nuclear particles in space, basically no heat will be generated, and the activity of the molecules will determine the level of heat.

Because the temperature is too high, it will cause people to have a certain sense of numbness, and it is impossible to withstand drinking too many things.

With regard to the phenomenon of photothermal effect, researchers so far have not been able to go beyond the framework of the theory of relativity.

Which form of motion should be chosen between the "light particles" (light energy particles) and the "beam wave" (the wave motion of light energy)? The jury is still inconclusive, and the inconclusive nature does not affect the radiative motion of space light waves or particle waves. Until now, the speed of light is still considered to be the most teleported material in space.

The movement of the sun's rays, as the basis for the exploration and discovery of all visible matter and energy by human beings on the earth, is looked up to and worshipped, and people are also frozen in the planetary system by the speed of light.

According to the theory of relativity, space light sources are usually the first to react to a natural photothermal effect, such as the sun, and there are trillions of light and heat dual-source planets in space. The heat energy emitted by the dual-source celestial body is carried by light energy and radiates in all directions.

In the confined space of the earth, we believe that the forms of heat conduction are radiation, convection, and medium conduction. Among them, whether thermal radiation can expel the speed of light to move independently has not been studied, but it can be clear that in the semi-open galaxy space, the movement of thermal radiation cannot expel the speed of light, and the thermal energy can only radiate with the light energy.

In the process of radiating light and heat at the speed of light and energy in space, once it touches gas, liquid, solid and cotton, the heat energy will be transferred and consumed by the medium conduction, and become other forms of energy. After the light is blocked by the medium, it will identify the qualitative nature of the medium, and if it can pass through, it will penetrate through the past and continue to move, and when it cannot penetrate, the light energy will collapse and shrink and project the image of the medium to the next medium in the direction of movement, which is called the image effect of light energy.

There are still a few problems that the theory of relativity does not explain:

1. Is the initial reaction mode of the natural photothermal dual source in space consistent with the substance?

2. What is the difference between a cold light source and a hot light source, is it because of the size of the moving space, or because the heat energy is conducted and absorbed by the transparent star material during the movement of the light?

3. Can light energy be independent of heat energy due to convective movement that causes light to shrink and collapse? Is the mainstream energy of a dual-source star light or heat? Is there a relationship between the thermal energy of the planet and the energy of light?

The finite nature of scientific theories depends on the infinite nature of philosophical speculation.

This is because the energy of sunlight is converted into heat energy, and through the transfer of medium, there is a certain amount of heat loss in this process, but it will not lose too much, so it can make sunlight hot.

Heat itself is the thermal motion of molecules, and molecules do not emit heat without thermal motion, which is why this happens.

Because sunlight is a high-energy particle, this high-energy particle rubs against the earth and heats up its body temperature.

Because under the sun's irradiation, the earth will have a suitable temperature, and there will be different changes, which will also heat the earth's surface.