In the past, when we went to school, many of us had a habit. It is a habit to write the address of the school after writing the address in the notebook and then extend the address to Kerala, India, Asia, Earth, Solar System and Universe.
But if you write such an address now, Earth, Solar System, Orion Arm, Milky Way Galaxy, Local group, Virgo Supercluster, Laniakia super cluster (Laniakea Super Cluster), the universe (Universe) will have to write.
You already know that the Earth, the Sun and the Solar System are located in a galaxy called the Milky Way Galaxy. The Milky Way is a spiral galaxy. It has a lot of pyrene-shaped hands. In it, our solar system is in what is called the Orion Arm.
The Milky Way galaxy has some tiny satellite galaxies. They orbit the Milky Way galaxy. The Andromeda Galaxy is another large galaxy located close to the Milky Way galaxy. It also has some small satellite galaxies.
The local group “The Local Group” is made up of the Milky Way galaxy, the Andromeda galaxy, the smaller galaxies that surround them, and the Triangulam galaxy. It is not known exactly how many galaxies are in the local group. Because many of them are hidden by our own galaxy. However, it is estimated that about 80 galaxies, both large and small, will be seen. The size of the local group is one million light-years
The largest group of galaxies known as the Virgo Supercluster is made up of about a hundred galaxy groups, such as our Local Group. It is about 11 million light-years across.
The Virgo Supercluster is part of a larger group of galaxies called the Laniakea Supercluster. About one million galaxies can be seen inside the Laniakia supercluster. Its size is about 52 million light years. Prior to the discovery of the Laniakia supercluster, all galaxies in the Virgo supercluster were known to be moving toward some invisible object. In those days it was called The Great Attractor. Now we know that it is the center of the Laniakia super cluster.
It is estimated that there are about 20 billion galaxies in the universe, including many galaxy superclusters, such as the Laniakia supercluster. There are galaxies in the universe and empty spaces where there are no galaxies at all. The two strands together form a vast network of galactic filaments in the universe. Each tiny speck of light in the filament chain shown below is a galaxy, and each large dot of light is a galaxy cluster.
When you know all this, you will remember what a poet sang in the past.
“Infinite Unknown is indescribable
This is the way the world spins.
It was sitting somewhere
What do you think?