Write an explanatory note on the ‘Big Bang Theory’.
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Big Bang Theory
The most popular argument regarding the origin of the universe is the Big Bang Theory. It is also called expanding universe hypothesis. In 1920, Edwin Hubble provided evidence that the universe is expanding. The Big Bang Theory was postulated in 1950s and 1960s and validated in 1972. According to this theory, everything in the universe emerged from a point known as singularity about 13.7 billion years ago. As the universe expanded, the hot radiation in the original fireball also expanded and cooled down. Misty clouds of matter already existed. As those clouds collapsed upon themselves, they were pulled together by their own gravity and formed clusters of galaxies with the galaxies themselves breaking up into stars like those of the Milky Way. The stars might have broken up to form their planets like those of our solar system.
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Thanks for such information
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