Explanation

Origin of Universe There are several theories regarding the origin of universe but most accepted is Big-Bang theory. Big-Bang Theory This theory was proposed by Abbe Lemaitre in 1931. According to the Big-Bang theory about 15 billion years ago, cosmic matter was in a condensed form. Explosion took place which broke the condensed matter and scattered its fragments into space at an enormous velocity making a Big-Bang sound and thus the theory came to be known as the Big-Bang theory