The Big Bang Theory is the persisting cosmological approach which explains the origin and developments of the Universe. According to this theory, the universe was an utmost hot and dense sphererical ball which expanded rapidly. This expansion caused the Universe to cool again and again till the present state reached. Scientists suggest that the Big Bang occurred approximately 13.75 billion years ago which is predicted by various measurements. so it is reasonable to say this Universe is 13.75 billion years old. After the expansion from the single mass, the particles get converted into sub-atomic particles like proton, neutron and electrons. The big bang theory is a well acceptable one.
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