Author: Ruili'an | Pirates will be prosecuted
In the vast universe, there are endless, billions of celestial bodies. Because of gravity, huge galaxies like Milky Way were formed. It is hard to imagine that the solar system is just a trivial galaxy in the Milky Way. Galaxy like the solar system has reached hundreds of millions of them in the Milky Way. And in the universe, huge galaxies like the Milky Way are also hundreds of millions. In this issue we will discuss a celestial body that may not exist in the universe. This celestial body is called black dwarf . Since it does not exist, why should we discuss him again? Please be careful not to be impatient! We know that all the stars in the universe have life cycle , just like us humans, but the life cycle of human beings is not even a trivial one compared to the stars and other galaxies in the universe. However, it is easy to understand the evolution of the life cycle of this virtual star.
This has to be mentioned, a theory of doomsday in the universe. It is believed that the planet will become a black dwarf after the end of life. But so far, scientists have not discovered any black dwarfs. In other words, black dwarfs may be celestial bodies that do not exist in the universe. Since black dwarfs are small and medium-sized stars, they are in the later stages of evolution. It is about the ultimate product of the evolution of a star with a mass of the sun. It consists of low-temperature degenerate electron gas, the entire star body is in the lowest energy state, and can no longer generate energy radiation. It is mainly carbon and a small amount of dust, just like burned charcoal. It takes about two trillion years for the star's wreckage to evolve, while the universe is only 13.7 billion years old. Therefore, black dwarfs are just the result of scientists' assumptions based on theory.
Since black dwarfs are stating based on theory, they may appear in the future. How did this concept be introduced? Before answering this question, we must first understand how black dwarfs are formed. In the universe, stars like , sun mass or smaller can eventually evolve into black dwarf bodies and cannot emit any radiation energy. They are in a degenerate state. So what is degenerate state ? In physics, degenerate states refer to multiple different fine physical states of the same physical state. For example, in quantum mechanics , the electrons in atom at the same energy level determined by their energy can have two states with different spin quantum numbers, and this energy level state is the degenerate state of two different spin states.
Black dwarf is a relatively small star. During its entire life cycle, it is in the final exhaustion stage and its energy has been exhausted. The mass of these stars is no longer several times the mass of the sun, and then it triggers nuclear fusion . Since a star, from its formation to its evolution into a black dwarf, its life cycle is longer than the age of the current universe, no black dwarfs have been found in the current universe. Assuming that there are black dwarfs in the universe, it is also very difficult to detect them. Since they have stopped emitting radiation, even if there are extremely small sources of radiation, they will be obscured by microwave radiation in the universe. Even if gravity detection is used, the detection effect can be achieved for a small-mass star body. This difficulty is equivalent to detecting a non-luminescent star with the same size as white dwarf . With existing science and technology, it is difficult to tell whether it is a planet or a black dwarf.
In the vast universe, all celestial bodies come from the evolution of stars. In the ancient Hongmeng era, that is, before Pangu opened the sky, the world was in a chaotic period of dispersed gas composed of hydrogen element . The molecular clouds formed by these hydrogen elements gradually gathered together under the action of gravity, thus creating the first Big Bang. After this, the first generation of stars was produced. Nuclear fusion and a series of chemical reactions inside the stars will forge the hydrogen element into some heavier elements. When a star dies, these heavy elements will scatter in the universe as the star explodes.After a long follow-up traction fusion, it is formed into a new planet or satellite . Due to the different mass of their astral bodies, the outcome after exhaustion is also different.
Stars with larger mass and more than 30 times the mass of the sun will produce very intense and huge fusion energy. We call this phenomenon the Super Star Explosion. It will disintegrate huge stars, causing a large amount of matter to be emitted into the universe. Unlike us, the explosion we understand will disintegrate stars into pieces or powder. Instead, it forms a higher density celestial body, just like it is tempered and reborn after a long time of tempering. More powerful and strong, this celestial body is a black hole.
Stars with moderate mass and more than ten times the mass of the sun, when such stars are exhausted, a supernova explosion may also occur. However, because its energy is relatively small, after the explosion, all that can be left is the core celestial body. He cannot become a celestial body like a black hole. We call this celestial body, a neutron star. If there are companion satellites like the moon around it, they may constantly absorb its substance. After a long and continuous evolution and contraction, the mass of this neutron star has become larger and larger, until the repulsive force of the neutron star cannot prevent the contraction force. Under the squeeze of gravity, it becomes powder and eventually becomes a black hole.
So, although the black dwarf has not been discovered, it does not mean that it has no possibility of existence. According to the evolution time of black dwarfs, it takes about 20 billion years, and this time limit far exceeds the life cycle of the universe we know is 13.7 billion years. Therefore, it is not that the black dwarf does not exist, but that it has not yet formed, or is in the process of formation. Do you think so?
