The Big Bang, creation of the Universe

 

There are several theories which are proposed by the scientists about the creation of the universe. Among all the multiple scientific theories only the big bang theory is widely accepted. According to this theory the universe were aerated from an infinitely dense tiny particle which could be a few millimetres wide. This tiny particle is called singularity. Approximately 13.7 billion years ago this particle was exploded. Due this violent explosion the matter, energy, time and space were created. After that the universe was created through two stages radiation era and matter era. In the radiation era there were not any matter. Only the gravity, strong and weak nuclear energy and electromagnetic waves existed at that early stage. Afterward the universe started to expand. At that moment the universe was very much hot and dense. The electrons, quarks and antiquarks were existed during this period. Then the universe started to cool down and neutrons and protons were created

          At the early stage of matter era at first the helium was created and universe expanded rapidly. The universe started to cool down and the second element hydrogen was created. Due to the gravity these helium and hydrogen atoms brought together and formed atomic cloud. These atomic clouds were the ancestors of the numerous galaxies. From the atomic clouds several gasses started to form. Due to the expansion the universe became less dense. The gasses gathered due to the gravity and formed galaxies. With a galaxy numerous numbers of stars and planets were created. These planets were started to orbit their nearest stars and formed several solar systems.

          At the present day we are living in a galaxy which is called the Milky Way galaxy. Our nearest galaxy is the Andromeda galaxy. The universe is still expanding and all the galaxies are getting away from each other. So, though this big bang theory the scientists have explained the creation of universe and all the matters within it.