Write a brief note on Big Bang theory
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The Big Bang is the name that scientists use for the most common theory of the universe,[1][2][3] from the very early stages to the present day.[4][5][6]
The Big Bang theory is that the universe has not always existed. It states that the early universe was hot and dense. As time passed the universe expanded, cooled, and became less dense. The Big Bang theory can explain why the universe looks the way it does. It explains why distant galaxies are moving away from us, and why the speed that they move away from us is proportional to distance. It explains why most of the visible universe is made of hydrogen and helium. It explains why there is a cosmic microwave background.[7]
Working backwards suggests that there would have been a time when temperatures and density were infinite.[8] Scientists are undecided whether this means the universe began from a singularity, or that current knowledge is insufficient to describe the universe at that time. Detailed measurements of the expansion rate of the universe tell us that the Big Bang happened at around 13.8 billion years ago. This is the age of the universe,
Early ideas of the Bang suggested a "cosmic egg ". Modern models say the whole early universe was hot and dense, and so there is no "centre" to the universe. Nor is there any place where the Big Bang happened, Instead the Big Bang was everywhere.[9][10] The expansion of the universe is the expansion of the spacetime and not the motion of atoms through space.
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