BIG BANG THEORY

Many people think that how this big universe came into being. Some think that the formation and end of anything have no origin. But in fact, this is the misconception!

  The answer to the question that how the universe came into being lies in the theory of the BIG BANG. This theory is an effort to describe and explain how the universe, stars, planets, comets, asteroids, and other particles formed and what happened at the very beginning.

  In 1927, a Belgian cosmologist and a catholic priest George Lemaitre proposed the BIG BANG theory. This big bang took place nearly about 13 billion years ago, and the universe started from just a single point which was full of high temperature and high density. This concept of the beginning of the universe from a single point is known as the concept of Singularity. 

  When the big explosion occurred, the fireball of high temperature and density broke into various pieces and this is how the stars, planets, and other bodies are formed. The first element formed was hydrogen and it was in abundance along with small quantities of helium and lithium.

   The big bang theory gives the cosmological model of the present observable universe and the theory is completely compatible with the Hubble-Lemaitre law, which states that:

"The galaxies are moving farther at the speed proportional to their distance."

  According to Hubble, the beginning of the universe satisfies the concept of singularity and the galaxies are moving farther. Thus, Hubble law and Lemaitre's theory have common concepts.

  The expansion of the universe is accelerating and this expansion will remain to continue!. The expansion rate of the universe describes the age of the universe. It tells the approximation that how old the universe is.

  Moreover, the model of the universe proposed by the big bang theory is not absolute but it is much comparable with the present universe. The present universe came into being as the result of very large-scale evolution!.