The largest cosmic structure is the Great Wall of the Universe. What is the Great Wall of the Universe? Let’s start with the solar system.

The universe contains a huge number of celestial bodies and various types of matter, but these things are not scattered freely in the universe. Under the influence of mutual gravity, they form relatively stable operating structures. For example, the Earth-Moon system is such a structure.

Planets like the Earth and satellites like the Moon form a very small cosmic structure. So what is the largest known single-body cosmic structure? We call it the "Great Wall of the Universe." What is the Great Wall of the Universe? We have to start with the solar system. The solar system we are in is a very common cosmic structure, which we call a star system. The star system is dominated by stars, and all planets, dwarf planets, asteroids, satellites of planets, comets, and other cosmic matter are stably orbiting the stars under the gravitational force of the stars.

There are 8 planets in the solar system including the Earth, no less than 173 known satellites of planets, more than 500,000 asteroids and an uncertain number of dwarf planets.

How can the sun control the orbits of so many celestial bodies? In fact, it is just two words: gravity. The sun itself accounts for 99.86% of the total matter in the solar system. Compared with other celestial bodies in the solar system, the sun's gravity is extremely strong, so a basic cosmic structure was formed under the leadership of the sun. Outside the solar system is a larger but also very common cosmic structure. We call this structure a "galaxy", and the galaxy where the solar system is located is called the "Milky Way". In the solar system, all celestial bodies revolve around the sun, and the sun itself seems to be constant and motionless, but in fact the sun is the fastest star in motion, but we are in it and cannot feel it.

The sun moves at a speed of 230 kilometers per second. What does this mean? The earth revolves around the sun at a speed of about 30 kilometers per second, so the sun moves much faster than the earth.

So why is the sun moving so fast? Where is it going? The movement of the sun is also caused by another more powerful gravitational source, which is the center of the Milky Way: the galactic center. There is a galaxy-level black hole in the center of the Milky Way. Its strong gravitational force drives the dense cosmic bodies around it to move at high speed, and these celestial bodies will further drive the movement of the outer celestial bodies, so a strong gravitational core is formed. There are 100 billion to 400 billion stars of varying sizes in the Milky Way, and they all run stably around the center of the Milky Way.

For us who only have one star around us, the Milky Way, which is composed of hundreds of billions of stars, is an extremely large celestial system, but it is still just a very small cosmic structure in the universe.

Surrounding the Milky Way are the Andromeda Galaxy, the Triangulum Galaxy, and dozens of smaller galaxies. Together, the Milky Way and these galaxies form a larger cosmic structure: the Local Group, which in turn belongs to an even larger cosmic structure: the Super Virgo Cluster. How many galaxies are there in the Super Virgo Cluster? Conservative estimates put the number at more than 2,000. 2,000 galaxies is an extremely large number, and the Super Virgo Cluster, which has more than 2,000 galaxies, is just a branch of another larger cosmic structure.

This cosmic structure, which is larger than the Virgo Supercluster, is called the Laniakea Supercluster, and its total mass is equivalent to that of 100,000 Milky Way galaxies.

What force is controlling the movement of such a huge cosmic structure? In fact, as early as more than 40 years ago, astronomers discovered that the temperature on both sides of the Milky Way is not equal, that is, the temperature on one side is higher and the temperature on the other side is lower. What is temperature? The essence of temperature is movement. The higher temperature on one side means that the celestial body on one side moves faster than the other side. Why is the movement speed faster on one side of the Milky Way than on the other side? Because there is a huge gravitational source in this direction, which affects the movement speed of celestial bodies in the Milky Way, so this invisible huge gravitational source is called the "great source".

Through the analysis and research of the radio information of the giant attractor, it has now been basically confirmed that the giant attractor is located at the center of the Laniakea Supercluster, and the Milky Way and hundreds of thousands of galaxies are moving towards this giant attractor.

So is the Laniakea Supercluster the largest cosmic structure? No. In the modern cosmological model, the largest cosmic structure is called the "Great Wall of the Universe", which is an extremely large and complex cosmic structure. It is like a giant wall standing in the universe. So what role does a huge cosmic structure like the Laniakea Supercluster play in the Great Wall of the Universe? To put it in a more figurative way, the Laniakea Supercluster is like a node on the Great Wall of the Universe, nothing more.

For more information, please follow the official account: sunmonarch