The universe contains a huge number of celestial bodies and various kinds of matter, and these things are not freely scattered in the universe, they form a relatively stable operating structure under the mutual gravitational force, such as the Earth-Moon system is such a structure.
Planets like Earth and moons like the Moon form a very small-scale cosmic structure, so what is the largest known single-scale cosmic structure? We call it the "Great Wall of the Universe." What is the Great Wall of the Universe? Let's start with the solar system. The solar system we live in is a very common cosmic structure, which we call a star system. Star systems are dominated by stars, and all planets, dwarf planets, asteroids, planetary moons, comets, and other cosmic matter orbit the stars steadily under the gravitational pull of the stars.
The solar system has 8 planets, including Earth, no less than 173 known moons, more than 500,000 asteroids, and an uncertain number of dwarf planets.
How can the sun firmly control the trajectory of so many celestial bodies? It's actually two words, gravity. The sun itself accounts for 99.86% of the total material of the solar system, and the gravitational pull of the sun is incomparably strong compared to other celestial bodies in the solar system, so a basic cosmic structure is formed under the domination of the star of the sun. Beyond the solar system, there is a much larger but also extremely common structure of the universe, which we call "galaxies," and the galaxies in which the solar system resides are called the Milky Way. In the solar system, all celestial bodies revolve around the sun, and the sun itself seems to be constant, but in fact, the sun is the fastest movement of the star, but we are in it, and we can't feel it.
What is the concept of the sun moving at speeds of up to 230 kilometers per second? The speed at which the Earth orbits the Sun is about 30 kilometers per second, which shows that the Sun is moving much faster than the Earth.
So why does the sun run so fast? Where is it going? The sun's motion also stems from the involvement of another, more powerful gravitational source, which is the center of the Milky Way: the silver center. There is a galaxy-level black hole in the center of the Milky Way, and its strong gravitational pull drives the surrounding dense cosmic celestial bodies to move at high speed, and these celestial bodies will further drive the outer celestial movements, so a strong gravitational core is formed, and there are 100 billion to 400 billion stars of various sizes in the Milky Way, which are stable around the center of the Milky Way.
For us with only one star around us, the Milky Way, made up of hundreds of billions of stars, is an extremely large celestial system, but it is still a very small cosmic structure in the universe.
Around the Milky Way are the Andromeda, Triangular, and dozens of smaller galaxies, with which the Milky Way forms a larger cosmic structure: the Local Group, which in turn belongs to a larger cosmic structure: the Supervirtual Cluster. How many galaxies are there in the Supervirtus Cluster? Conservative estimates, at more than 2,000. 2,000 galaxies, which is an extremely large number, and such a Supervirtus cluster with more than 2,000 galaxies is just a branch of another larger cosmic structure.
This larger cosmic structure than the Supervirtus Cluster, which we call the "Ranyakea Supercluster," has a total mass equivalent to 100,000 Milky Way.
What forces are dominating the operation of such a vast cosmic structure? In fact, as early as 40 years ago, astronomers found that the temperature on both sides of the Milky Way is not equal, that is, the temperature on one side is high and the temperature on the other side is low. What is the temperature? The essence of temperature is movement, and a high temperature on one side indicates that the celestial bodies on one side are moving faster than the other. Why is it that on one side of the Milky Way, it moves faster than on the other? Because there is a huge gravitational source in this direction, and it is precisely because it affects the speed of the celestial bodies in the Milky Way, this invisible huge gravitational source is called a "giant source".
Through the analysis and study of the radio information of the giant source, it has now been basically determined that the giant source is located at the center of the Ranyakea supercluster, and the Milky Way and hundreds of thousands of galaxies are moving in the direction of this giant source.
So is the Raniakea Supercluster the largest cosmic structure? No. In the modern model of the universe, the largest cosmic structure on a single scale is called the "Great Wall of the Universe", which is an extremely large and complex cosmic structure, which stands like a huge wall in the universe. So what role does a massive cosmic structure like the Raniakea Supercluster play in the Great Wall of the Universe? Graphically, the Ranyakea Supercluster resembles a node on the Great Wall of the Universe, nothing more.