How did a spherical cloud, about two light-years in diameter, form around the solar system?

The solar system is one of the 100 billion star systems with Galactic coefficient. It is an ordinary star system and an extraordinary galaxy at the same time. It’s common because it’s not essentially different from other star systems. It’s also a star with different number of planets around it. It’s extraordinary because the solar system gave birth to the earth, the planet of life.

Life is a complex and mysterious thing in the universe, especially intelligent life. It has been more than half a century since human beings entered the space age. Through a large number of observations, up to now, we have not found any extraterrestrial life or any trace of extraterrestrial civilization.

From this, we can see that even if there are other life and civilization in the universe, it must be very rare. Because of the appearance of the earth, the birth of human beings in the solar system is no longer ordinary. The eternal theme of the universe is darkness, cold and loneliness. Originally, the solar system was also a dead galaxy, but after the birth of life on earth 3.8 billion years ago, it gave the solar system the breath of life.

After a long period of evolution, life on earth finally evolved into human beings millions of years ago. After continuous evolution and development, human beings embarked on the road of science and technology hundreds of years ago. The emergence of science and technology makes human beings put on the wings of flying, walk out of the earth and see the vast universe.

After walking out of the earth, the first thing we see is our solar system. If we want to understand the mystery of the universe, we must first understand the mystery of the solar system and explore all the secrets of the solar system. The solar system is a stellar system, although it is not uncommon, but in terms of physical rules, Galaxy rules, and other aspects, it is the same as other stellar systems.

Therefore, as long as we have solved all kinds of mysteries of the solar system, we will have basically solved the mystery of the stellar system, which can further our understanding of the universe. There are eight planets in the solar system. The nature we know best is also the parent planet earth. After human beings enter the space age, the first step to explore is the moon, which is an important step for human beings to enter the universe.

In the following years, the human probe explored Venus and landed on Mars. In the process of going out of the solar system, the Voyager spacecraft also explored the major planets one after another, and successfully passed through the heliopause and entered interstellar space.

If we want to understand the solar system, we must first determine the general scope of the solar system. How large is the scope of the solar system? Maybe in the eyes of many people, the problem is very simple. The range of the eight planets is the range of the solar system, or even further to the Kuiper belt.

The Kuiper belt is a huge celestial body belt around the solar system, in which there are a large number of asteroids and dwarf planets. Pluto, once the ninth largest planet, belongs to the Kuiper belt, but Pluto was kicked out of the list of nine planets by scientists in 2006, and it only belongs to dwarf planets at present.

When human beings just walked out of the earth, scientists divided the scope of the solar system by taking the Kuiper belt as the boundary. So, many people think that Voyager 1 and Voyager 2 have crossed the Kuiper belt, and that they have gone out of the solar system and into extrasolar space. Is that really the case?

With the continuous improvement of human observation technology, scientists have found that there is a spherical cloud in the periphery of the Kuiper belt, which envelops the solar system and is called the Oort cloud by scientists. This spherical cloud, with a diameter of two light-years, completely envelops the solar system, from which comets we often observe come.

After the discovery of the existence of the Oort cloud, scientists re divided the scope of the solar system. At present, when we talk about the solar system, we take the Oort cloud as the boundary. Only when we get out of this cloud cluster can we really get out of the solar system and enter the space of the extrasolar system. According to the new classification, Voyager 1 and Voyager 2 are still far from coming out of the solar system. It is conservatively estimated that it will take 15000 years.

How did this vast Oort cloud form? Is it attracted by the gravity of the sun? Of course not. In fact, the gravitational range of the sun is very limited. What we call the heliosphere is the limit position of solar radiation, which is located in the Kuiper belt. Out of the Kuiper belt, the sun’s gravity basically can not affect, so the Oort cloud is not the cosmic dust attracted by gravity, so how is it formed?

In fact, the existence of the Oort cloud is longer than the solar system. To solve this mystery, we need to start from the origin of the solar system. Every star system originates from a nebula. When the sun was not born five billion years ago, the position of the solar system is now a solar nebula.

Under the influence of a strong force, the solar nebula began to rotate rapidly. At the same time, a large amount of matter began to gather towards the center. With the passage of time, the density of matter in the center becomes more and more large, forming a primitive solar celestial body. After the formation of the primitive sun, there is a stronger gravitational acceleration to attract the matter of the entire solar nebula, which eventually ignites the nuclear fusion in the center and becomes a star.

The formation of the sun consumes most of the material of the solar nebula, and the rest forms planets and other celestial bodies. There were hundreds of planets in the early solar system, and only eight of them were left after continuous collisions. Has the matter of the solar nebula been completely evolved? Of course not.

After all, the scope of the sun’s gravity is limited, while the scope of the solar nebula is very broad. The material outside is not pulled by the sun’s gravity, so a large area of space is formed between the eight planets and the nebula, which is the space where Voyager 1 is now, also known as the interstellar space of the solar system, with very little material.

This area of the solar nebula was not pulled by the sun’s gravity to form the later Oort cloud, which envelops the solar system. The vast Oort cloud is of great significance to the solar system. Scientists speculate that the evolution of life on earth may also be related to this nebula.

The early earth had been hit by a large number of comets, and these comets brought rich heavy metal resources to the earth, and may also bring the seeds of life. At the same time, the Oort cloud is also a powerful Galaxy shield. If you want to observe the solar system from the extrasolar space, the first thing you can see is the Oort cloud. It can block the attention of extrasolar eyes, which may be the reason why there is no alien civilization in the solar system.

Perhaps it is the existence of the Oort cloud that makes the alien civilization mistakenly think that it is just a nebula and there is no galaxy or civilization. This is undoubtedly good news for human beings. With the current scientific and technological strength of human beings, once there is a huge technological gap with alien civilization, human beings will not have the right to speak. If the alien civilization is malicious to human beings, we will have no resistance and may bring the end of the whole civilization.

Of course, the Oort cloud also hinders human beings from going out of the solar system, with a diameter of 2 light-years. It is not so easy to go out. We need to develop our science and technology to a very high level. At least we need to realize controllable nuclear fusion technology before we can have the ability to go out of the solar system. In fact, this is also a good thing, so that mankind has a safer development environment. Once mankind can get out of the solar system, it means that our strength is not weak.

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