How is the cosmic hierarchy divided, and what is the cosmic star hierarchy?

Your question is not clear enough! Because we haven't figured out how big the universe really is. The concept of a celestial body itself is vague and it is not clear whether it refers to a single planet, galaxy, galaxy cluster, or galaxy cluster or galaxy cluster.

The universe we can see is the largest celestial body.

There are different levels of celestial systems, from lowest to highest, such as the Earth-Moon system, the solar system, the Milky Way, and the total galaxy.

To judge whether a substance is a celestial body, it can be summarized by "three looks": one is to see whether it is the existence form of matter in the universe, although interstellar matter is invisible to the naked eye, it is a celestial body; The second is to see if it is a matter in the universe, and a certain part of the celestial body is not a celestial body; The third is to see whether it is located in the earth's atmosphere, and it is a celestial body located in outer space, and it is not a celestial body located in the earth's atmosphere.

Celestial System Structure:

Few galaxies exist on their own, and many galaxies are bound by gravity between them and a certain number of galaxies. A group of about 50 galaxies is called a galaxy group, and a larger group of galaxies that spans millions of parsecs of space is called a galaxy group. Group of galaxies is usually ruled by a large elliptical star system, whose tidal force destroys neighboring satellite galaxies and adds mass to the galaxy.

Supergroups are huge aggregates of tens of thousands of galaxies, including groups of galaxies, groups of galaxies, and some lonely galaxies; At the supergalaxy group scale, galaxies are arranged in thin sheets and filaments, surrounded by huge holes. On these scales, the universe is isotropic and homogeneous.

The level of the cosmic realm is:

The level of civilization in the universe can be divided into 7 levels, among which human civilization is the only one we can come into contact with, perhaps human civilization.

It's too backward, so it can't communicate with the higher civilizations in the universe, but in the eyes of human beings.

Obviously, their own civilization is also very advanced, after all, human beings can spy on the universe and step into outer space.

Finish. When human beings can freely travel in outer space is only a matter of time, but the level of human civilization has been divided into levels.

Celestial systemsThere are different levels:

In order of rank, from low to high, it is the Earth-Moon system and the solar system.

Milky Way, and total galaxies.

1. Earth-Moon system, in the Earth-Moon system, the earth is the central celestial body, so the movement of the Earth-Moon system is generally described as the moon.

For the orbital motion of the earth.

2. The solar system is composed of the sun and the celestial bodies orbiting it under its gravitational attraction, including the sun and the eight planets.

and its moons, asteroids, comets.

meteoroids and interplanetary matter. The Earth, where humans live, is a member of the solar system.

3. The Milky Way, on a clear and cloudless night, people can observe that there is a cloud-like band of light in space as the Milky Way, which is actually composed of hundreds of billions of stars and nebulae.