Universe is defined as the totality of everything at exists including all the physical space, time, energy, matter, planets, star, galaxies etc. The usage of the word “universe” varies across people. In the words of Albert Einstein, “Two things are infinite: the universe and human stupidity; and I'm not sure about the universe. That deep emotional conviction of the presence of a superior reasoning power, which is revealed in the incomprehensible universe, forms my idea of God.” Universe was supposed to have begun with a bang. The universe can be used in different senses denoting concepts such as cosmos, world or nature. The theory that was responsible for the creation of the universe is called the “BIG BANG THEORY”. The universe had expanded from a completely dense phase called the Plank Epoch, in which all the matter and energy was concentrated. The universe has been completely expanding till date to its present form.
