The universe is vast and vast. At present, the diameter of the universe that can be observed by human beings is 92 billion light-years. Even if it is so large, it may only be the tip of the iceberg of the universe. With the continuous improvement of human science and technology, the scope of the observable universe will expand infinitely. I believe no one can know when we can see the boundary of the universe.
We all know that the universe is composed of innumerable galaxies, and there is at least one star in each galaxy. For example, our solar system is just a star sun, while some galaxies have two or three stars at the same time. The star is the boss of a galaxy, is the absolute ruler, it relies on its own strong mass and gravity to attract other planets and celestial bodies around it.
A galaxy will become orderly and stable only with the management of the star boss. Otherwise, the galaxy will be very chaotic and full of collision events. If a galaxy cannot be stabilized, there will be no life.
Our solar system is also the same. When the early solar system was just formed, it was also a chaotic galaxy. Every day, celestial collision events happened, and the whole solar system was full of dust and debris. But when the sun slowly formed, the power of boss came into play. Those chaotic planets began to stabilize under the influence of boss’s gravity, and each planet had its own orbit.
Those disobedient dust and debris were blown to the edge of the solar system by the solar wind, forming the present Kuiper belt. The internal environment of the solar system began to become clean and stable. After the appearance of such a stable solar system environment, the earth began to gradually give birth to life, become a living planet, and finally evolved into a civilized planet. From this, we can see that the universe is the CEO at the top of the pyramid, while countless stars in the universe are department managers, with different planets and celestial bodies under management.
No one can tell exactly how many stars there are in the universe, at least not less than a few trillion. So many stars must be large or small, and the gravity of stars with large mass is also great. Naturally, there will be more planets and celestial bodies that can attract and manage. For example, the star sun manages eight planets, some star systems may manage dozens of large planets, and some only manage a few rare ones Planets.
Stars vary in size. Some people have raised the question: is it possible for stars with a diameter of one light year to exist in the universe? How big is a light year? It’s about 9.4 trillion kilometers. The diameter of the sun is about 1392000 kilometers, and the sun is only a small person in the family of stars, not a big star. At present, the diameter of the largest star discovered by scientists is about dozens of times that of the sun, that is tens of millions of kilometers, far less than one light year. Even uy, the largest red supergiant discovered in the universe, has a diameter of only 2.4 billion kilometers, far less than a light year.
At present, scientists have found stars in the observable universe, whose diameters are far less than one light year, and have not found stars with diameters up to one light year. Some people may say that the current science and technology of human beings are still backward, and the universe is too big. There may be stars with diameters up to one light year outside the universe that human beings cannot observe.
We don’t know what the universe is like beyond human observation. But according to the research and analysis of scientists, it is almost impossible for the diameter of a star to reach one light year. Why do scientists say that? As we all know, the universe comes from the big bang of singularity, and stars collapse from nebulae by gravity. The more nebulae gather, the greater the mass and volume of stars. But it doesn’t mean that stars can grow infinitely. There is a limit that will prevent stars from growing infinitely.
After the big bang, huge energy instantly formed a lot of nebulae, these nebulae through mutual aggregation, mutual gravitational influence, a large number of material aggregation produced gravitational collapse effect, their own gravity will continue to compress themselves. On the other hand, the nuclear fusion reaction can be carried out in the core region which is strongly squeezed, and the resulting radiation pressure can resist the gravitational collapse. When one of the forces becomes stronger, the other will become stronger, and vice versa.
Why can’t stars grow infinitely? In fact, it is the influence of two kinds of gravitation. One is the gravity of the star itself, and the other is the radiation pressure produced by nuclear fusion. It compresses the star from the outside and expands outward, so that the gravity of the star itself cannot continuously absorb the external matter. When the two gravitations reach an equilibrium point, the volume of the star will reach the limit. This is the Eddington limit proposed by scientists.
Although the scope of the universe that can be observed by human beings may only be the tip of the iceberg of the universe, the whole universe can sometimes be seen from the local part. No star with a diameter of one light year has been found within the scope of the universe that can be observed by human beings. It is believed that it is difficult to see a star with a diameter of one light year beyond the scope of the universe that can not be observed by human beings. In fact, if a star with a diameter of half a light year appears in the universe, it will be enough to break the scientific view of scientists.
However, it is also said that human science and technology have only developed for hundreds of years, and they are still very backward. Their understanding of the universe is also very limited, and many things in the universe are constantly breaking the existing scientific outlook of human beings. It can be said that the universe is a vast and mysterious world. We don’t know how many mysterious existence exist in it. Human beings can not know how many alien civilizations there are in the universe, and how powerful these alien civilizations are.
It is only about 6000 years since the beginning of human civilization. There may be civilizations in the universe that have developed for more than a few billion years. We can’t imagine how powerful such a civilization is. Such a powerful alien civilization may be a god like existence for human beings. Although the strength of human civilization is still very weak and our understanding of the universe is very limited, we have discovered some secrets of the universe from the limited universe.
The existence of a large number of stars is one of the mysteries of the universe. Stars are the standard configuration of the universe. No matter within or outside the observable universe, they are believed to be inseparable from the existence of a large number of stars. They are the order managers of the universe. Through the study of stars, we will gradually understand the ultimate mysteries of the universe, and believe that human beings will be able to do it one day.
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