Where is the origin of the sun?

The sun also has its own system, the solar system, and the sun is the center of the solar system. So, where is the origin of the sun? We may have a general understanding from some popular science books. Now, let's systematically understand the origin of the solar system.

1543, Copernicus, a Polish scientist, put forward Heliocentrism in the Theory of Celestial Movement. Subsequently, Copernicus' fearless scientific spirit has been encouraging people to know the solar system and explore nature.

A galaxy revolving around the sun

1644, French scientist R. Descartes thought in "Principles of Philosophy" that the solar system was formed by the swirling motion of matter particles.

1745, French naturalist Buffon put forward catastrophe theory for the first time in general and special natural history. He believes that massive objects such as comets collided with the earth, and the sun material also flew out of space, and later formed the earth and other planets and satellites.

1755, German astronomer Kant put forward the system theory-nebula hypothesis in General History of Nature and Theory of Celestial Bodies. The solar system is a diffuse mass of interstellar matter, which is gathered together by gravity. The center of the solar system is the sun. Due to the increase of repulsion, the surrounding particles form clumps under the action of repulsion, and small clumps form planets and satellites.

1796, French astronomer P.S.deLaplace also put forward the theory of nebulae in the theory of cosmic system. He believes that all the celestial bodies in the solar system are formed by the same nebula. Primitive nebulae are gaseous, with high temperature and slow rotation. Then, the nebula gradually cools and contracts; Then the rotation accelerates, making the nebula flatter and flatter. When the centrifugal force exceeds the centripetal force, the rotating gas ring separates. Repeat again, and then generate multiple gas rings. In this way, the sun forms in the center of the nebula, while the halo forms a planet, and the hot planet forms a satellite in the same way.

In the scientific community, people collectively refer to the early nebula theory as Kant-Laplace theory. This theory dominated the origin of the solar system in the19th century. Because this theory cannot explain the mass distribution of planetary arrangement and the special distribution of angular momentum of the solar system, it has encountered difficulties. Therefore, people turned their attention to catastrophe theory.

1900, American geologist T.C. Chamberlain put forward the planetesimal theory about the origin of the solar system. Subsequently, Moreton developed this theory. A star once moved hundreds of kilometers away from the sun, causing huge tides on the front and back of the sun, throwing out a lot of substances and condensing them into small particles, called planetesimals. Planetesimals are embryos of planets and then gather into planets and satellites. Later, the "tidal hypothesis" put forward by Jenkins (J.H.Jeans 19 16) was slightly the same as the planetesimal theory put forward above.

There are many hypotheses about the origin of the solar system. This also shows that human beings have never given up exploring the solar system. Since the twentieth century, people's knowledge of astronomy has become more and more abundant. And realize that in the vast universe, the possibility of stars meeting is extremely small. Since 1950s, scientists have put forward many new theories, most of which are based on the nebula hypothesis. Here are the six most influential theories:

1.A.G.W.Cameron's theory mainly discusses the origin of the earth from two aspects: mechanics and chemistry, and calculates the evolution of nebula disks through turbulent viscosity theory.

2. Dai Wensai Theory. In 1950s, Dai Wensai put forward the theory of angular momentum repulsive disk.

3. The theory of Safronov (вссаронов) and C.Hayashi, whose theory is mainly the theory that turbulence forms disks and rings.

4. prentiss (A.J.R. Prentice)-New Laplace Theory. He put forward a new theory of turbulence in cold nebulae.

5. Ulf's floating theory. He put forward the catastrophe theory that small-mass stars meet celestial bodies.

6. Alvin's electromagnetic theory. This theory is based on the planetary formation theory of the strong magnetic field in the early sun.

These theories have their own characteristics. However, it has never been recognized. Then, a convincing theory of the origin of the solar system must clarify the following main problems:

1. Origin and characteristics of primitive nebulae.

2. The formation process of primitive nebulae or planetesimals.

3. The formation process of the planet.

4. Features of planetary orbits: * * area, isotropy and nearly circular.

5. Titius-Bode rule.

6. Angular momentum distribution of the solar system.

7. Three types of planets: Earth-like planets, giant planets and distant solar planets are different in size, mass and density.

8. The rotation characteristics of planets.

9. Formation of satellites and rings.

10. The origin of asteroids.

1 1. The origin of comets.

12. the origin of earth-moon system.

Since the late 1980s, scientists have had a tendentious understanding of the origin of the solar system. We reasonably divide our understanding of this tendency into several stages of evolution, plus in-depth analysis. In this way, the origin of the solar system can be clearly presented to people.