Every day we can feel the sun rising from the east and falling from the west. This happens because the sun is revolving around the sun. The revolution not only produces the sun rises and sets on the earth, but also makes the earth produce In addition to the changes in the four seasons, the changes in the four seasons are an important reason for the diversity of the earth’s species. Therefore, if there is no earth revolving around the sun, there may not be such a colorful creature on the earth. Why does the earth revolve around the sun?
The earth revolves around the earth, and the revolution period is 365 days, which is 1 year.
This has to be said from the beginning of the formation of the sun, the sun is produced by the collapse of gravity A high-temperature and high-pressure center is formed by adsorbing the surrounding cosmic dust. The center of gravitational collapse is rotating at a high speed. Some cosmic nebula dust that was thrown out when the sun formed formed the earth. Although the cosmic dust was thrown out, the sun had gravity. And is moving at high speed, so the earth formed by these cosmic nebulae dust is still revolving around the sun, and the sun’s gravitational force has not disappeared, so the earth has been revolving around the sun to this day, and there are seven planets like the earth in the solar system. Revolving around the sun, these eight planets and their satellites, as well as some asteroids, meteorites, and the sun together form the solar system.
The solar system revolves around the black hole at the center of the Milky Way, with a period of 250 million years.
Not only the earth has a center of revolution, the solar system actually has a center of revolution, and this center of revolution is the Milky Way. According to the observation and analysis of scientists, there is a supermassive black hole in the center of the Milky Way. The solar system is affected by the gravitational force of this black hole, so it revolves around this black hole. We know that the earth revolves around the sun for 365 days, which is one year. Then do you know the revolution period of the solar system?
The position of the solar system in the Milky Way
Scientists found that the solar system is 26,000 light-years from the center of the Milky Way, and the solar system’s revolution speed is 220 kilometers per second. It can be calculated that the solar system’s revolution period is as long as 250 million years, which is equivalent to that humans have returned to the end of the Permian from now. At that time, dinosaurs were not born. Dinosaurs were born 230 million years ago. This shows that the sun revolves. How long is the cycle? At this point, we already know that the earth revolves around the sun and the solar system revolves around the center of the Milky Way. Do you know what celestial body the Milky Way is revolving around?
Schematic diagram of the universe structure
To know what celestial body the Milky Way revolves around, then we must know what the upper-level celestial body of the Milky Way is. Many people think that the largest celestial structure in the universe is a galaxy. In fact, it is not. The real celestial structure of the universe should be like this: asteroid-satellite-planet-star-galaxy-galaxy cluster-super galaxy cluster-super galaxy The group complex-the Great Wall of the universe-the universe. From the structure of the celestial bodies in the universe, we can see that a celestial structure larger than a galaxy is called a galaxy cluster. The Milky Way is located in a galaxy cluster called the local galaxy cluster. This galaxy cluster has a diameter of 10 million light-years. In this galaxy cluster There are more than 50 large and small galaxies in the local galaxy cluster, but the two largest galaxies in the local cluster are the Milky Way and the Andromeda Galaxy. The others are small galaxies attached to the Milky Way and the Andromeda Galaxy, such as the Large and Small Magellanic Clouds. Triangular galaxies, etc. These small galaxies are called satellite galaxies of the Milky Way and Andromeda Galaxy.
The local galaxy cluster where the Milky Way is located, with a diameter of 10 million light-years and containing more than 50 galaxies
Because the Milky Way and Andromeda Galaxy are only The two giant galaxies of the second two, and because the volume of the two galaxies is not very different, there is no galaxy in the local galaxy cluster that can function as a central galaxy, that is to say, the Milky Way does not rotate around any galaxy in the local galaxy cluster. Although silverThe river system does not revolve around any galaxies, but the Milky Way galaxy revolves around a central point, which is located at the center of the distance between the Milky Way and the Andromeda Galaxy. Why is this central point formed?
The Milky Way rotates around a central point
Because in this cluster, the Milky Way and Andromeda Galaxy are the largest and most massive, so these two galaxies are the largest and most massive. A giant galaxy produces a huge gravitational attraction. Because the two galaxies are attracted to each other, a center point is formed between the two galaxies. It is like a rope tied to two stones, and then the rope is rotated and thrown out. A center point for stabilizing the two rocks is formed in the middle, and the gravity generated by the Milky Way and the Andromeda galaxy is like an invisible rope dragging the two galaxies around this center point.
Schematic diagram of the collision between the Milky Way and the Andromeda Galaxy
However, the distance between the Milky Way and the Andromeda Galaxy is not static. They are constantly rotating around the center point. Close to the ground, it will eventually collide and melt together in about 3.5-4 billion years.
Source: Qin Xiaolaan chat text
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