About 13.8 billion years ago, our infinite universe was contained inside an energy sphere smaller than an atom. Where time had no existence. Due to some mysterious reason, this energy sphere exploded. Energy started spreading all around and the universe came into existence. We call it the Big Bang.
 |
| Big bang |
After the Big Bang incident, energy started spreading around and at the same time space was born and at the same time 'time' came into existence. This energy continued to spread for millions of years and gradually this energy started to cool down and it was due to this energy that, matter was formed. And quarks, electrons, protons and neutrons were formed.
At that time, two types of things were formed. The first was the 'Matter' that made this world, and the second was the 'antimatter', which was the opposite of the 'Matter'.
When Matter and Antimatter met, they would kill each other, but Matter was little more than AntiMatter, and a Matter ball survived and there was nothing else that could kill it, so it exploded. which proved lucky for us because the whole world was going to be made with that one bullet.
The universe of stars and planets came into existence due to this ball of matter. After that explosion, everything started to cool down and everything started to form.
In that universe which looks like dust, a force started working. Due to that force, the atoms started to join together and were attracted towards each other and that force was the force of gravity.
Initially most of the hydrogen atoms used to exist in that universe. The force of gravity began to compress hydrogen atoms. The place where hydrogen atoms were exposed due to gravitational force, The temperature of that place used to reach millions of degrees.
when the temperature of a place reaches upto one crore degrees then a process started called nuclear fusion. A lot of energy came out of it and the first star of the universe came into existence and in this way slowly stars started to form and millions of stars came into existence in millions of years.
Gradually these stars started coming in front due to the force of gravity and started living in groups and a group of billions of stars started appearing in this universe. These groups started forming in different forms and they are called as Galaxy. This is how millions of galaxies were formed.
From those galaxies one of the galaxy was the one in which we live today, named Milky Way. There were billions of stars present inside that galaxy and some dust was still left. But in a gap of thousands of years, gravity began to show its strength.
The dust which was present, Due to the force of gravity, it also started to appear and due to this many planets started to form and all the astroid-like pieces started getting together due to gravity. During the formation of these planets, a rocky planet was also formed. Such a planet whose surface was solid and that planet was earth.
 |
| Earth |
The remaining pure hydrogen atoms also started mixed together. Some remaining hydrogen atoms began to form a star. All the hydrogen atoms started coming closer together and the temperature increased so much that nuclear fusion started. And a star named Sun came into existence.
When the sun formed, it errupted a very strong solar-wind, which led to dust particles coming out of the solar system, and eight planets and the rest of the satellites which were larger in size remain in solar system, and the solar system started to look like it is now visible.
Many gas's planets began to form on the outer side of the Solar System, such as Jupiter Saturn, Uranus, Neptune etc. And rocky planets began to form on the inner side of the solar system such as Mercury, Mars, Venus and our lovely earth.