Question

what do you mean by Big Bang Theory?

Answer 1

The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it says the universe as weknow it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today.

Answer 2

Hey mate ,

here is your answer :)

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The Big Bang theory is the prevailing cosmological model for the universefrom the earliest known periods through its subsequent large-scale evolution.

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The model describes how the universe expanded from a very high-density and high-temperature state, and offers a comprehensive explanation for a broad range of phenomena, including the abundance of light elements, the cosmic microwave background (CMB), large scale structure and Hubble's law.

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If the known laws of physics are extrapolated to the highest density regime, the result is a singularity which is typically associated with the Big Bang.

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Physicists are undecided whether this means the universe began from a singularity, or that current knowledge is insufficient to describe the universe at that time.

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Detailed measurements of the expansion rate of the universe place the Big Bang at around 13.8 billion years ago, which is thus considered the age of the universe.