Big Bang theory was proposed in the year 1927 by a Catholic priest named Georges Lemaitre. The priest has highlighted the redshifts that happened in spiral nebulae and applied other Einstein’s theories to derive Hubble law. Even before Lemaitre, Alexander Friedmann had come forward to develop a theory to explain about general relativity changes.According to the theory, past and present matters in universe had occurred and evolved simultaneously and this happened about 13.8 billion years ago. All matters combined together at an intense heat and this process was called singularity. It was after the expansion of singularity that scientists realized that the universe had evolved. The theory then stated that universe underwent a cooling process where matters disintegrated into atoms and sub atoms that spread across the universe in the form of galaxies and stars.
Big Bang theory is all about the cosmic evolution of this universe. These cosmological models had multiple instances like inflation epoch, cooling epoch and structure epoch that affected the way the forces worked between atoms and shaped up the universe on the whole. It is interesting to note that these instances were reasons for natural elements to evolve in the universe and spread energies.
Just when big bang theory was introduced, there was a solid foundation to understand the formation of clouds and gases present in the universe. It guided scientists to calculate various effects of physics that acted in the space. Not just restricting to the cosmic background of universe, the theory was responsible to guide scientists towards concepts like light years, dark matter and crunch between elements.
Despite a number of theories that speak about formation of universe, Big Bang theory is known for its accuracy in the estimation of activities within space.
It is well known that the universe is expanding but the degree of expansion is not known. That is when Big bang theory came into picture. Unlike other theories that gave a vague definition about the evolution and expansion of universe, Big Bang theory is well supported with cosmological evidence. Perhaps, this theory is considered as the most accepted solution for a gravity theory on general relativity.
For example, it has given a detailed solution on how photons can impact the energy in the universe including temperature. What if the universe comprises of photons and neutrons?Big Bang theory has an answer to that and it tells the compounds formed from photons and neutrons. The nucleosynthesis is explained here unlike any other theories.
The theory does not restrict itself with a single concept. There are various models of Big Bang discovered in due course of time but models were created in an aim to give answers to untouched areas like ratio of net kinetic energy of universe to gravitational potential self energy. This detailed evidence makes it special and appreciable to scientists and researchers.