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⠀⠀⠀⠀⠀⠀⠀⠀The Big - Bang Theory

One of the most important theories about the beginning of this universe is the big-bang theory. The big-bang theory explains the formation of heavenly bodies like galaxies, stars and planets, etc., as follows : $<font color= red>$ According to the big-bang theory, all the matter in the universe was originally concentrated in one lump called primeval atom (which was a concentrate of neutrons and protons) exploded with a big-bang, and the matter started flying in all directions through space leading to the formation of galaxies of stars and other heavenly bodies. $<font color= </strong><strong>black</strong><strong>>$ Since then, all the galaxies are rushing away from one another causing the expansion of the universe. The big-bang theory suggests that the universe has a definite age and a definite size. The astronomers have estimated that the age of the universe is about 15 billion years. Compared to this age of the universe, the formation of earth and the origin of life on earth have occurred comparatively much more recently.

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The big-bang theory of the origin of the universe was proposed by a scientist named,$<font color= </strong><strong>blue</strong><strong>>$ Edwin Hubble.