The immense sky that surrounds the Earth and all the celestial bodies present in it (eg- Milkyway, stars, planets, satellites, etc.) and the entire energy is called the universe as a whole. The study related to the universe is called Cosmology.
The universe is so huge, which we cannot even imagine. The magnitude of its size, number of stars in it, immense distance and mass are difficult to estimate. However, it is tried to estimate them with the help of large result numbers. According to astronomers, there are hundreds of billions (10¹¹) of galaxies in the universe and about 100 billion stars in each galaxy.
Thus the total number of stars
10¹¹ × 10¹¹ = 10²² will be of the order.
Origin of The Universe
Many theories have been expressed about the question of the beginning of the universe and its future. Among all those theories, the Big Bang theory has gained the most recognition.
This theory was formulated at a time when astronomers were told based on observations by developed telescopes and other scientific instruments that our universe is constantly expanding. The rendering of the Big Bang theory is based on the following three explorations.
Continuous spread of the universe. The universe is full of electromagnetic radiation.
The greater mass of the universe is mysteriously beyond our sight.
Big Bang Theory
Big Bang Theory was given by the Belgian astronomer and pastor George Lemaitre. According to this theory, billions of years ago this universe was in a state of subsidence and as a point.
Scientists have called this point a point of singularity. A great explosion occurred at this point and it began to expand. This blast blasted the very dense body (point) and the broken portions of this body, that is, photons and leptoquarks gluon spun far into space and formed galaxies that are still escaping.
According to this theory, immediately after Big Bang, the universe changed from atomic size to cosmic shape in a time span of several times smaller than a second. After this, the speed of the universe slowed slightly but its temperature remained excessive for a long time. The stars and galaxies landed for the first time after a bad year.
Our solar system also formed 4.5 trillion years ago. Life on Earth began around 0.37 trillion years ago.
A British scientist named Hermann Bandy, Thomas Gold, and Fred Hoyle challenged the Big Bang theory.
In 1948, he introduced a new theory of the origin of the universe called the permanent state theory.
According to this theory, the universe neither started with the great explosion nor will it ever end, that is, there is neither the beginning nor the end of this huge universe.
According to this theory, galaxies are distant among themselves, but their celestial density remains refracted, that is, new galaxies are formed in the empty spaces between the far-flung galaxies.
Therefore the substance density of the universe remains constant.