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Tell me about the origin of our universe

The exact origin of the universe is not very clear; however, there are numerous theories that try to explain its origin. 'The Big Band Theory' is one such theories; it maintains that the universe is enlarged with inconceivable speed from its pebble-size origin to enormous scope within a trillion-trillionth of a second, following the big bang.

The Big Bang model is the most widely accepted scientific theory of the universe’s origin. It holds that 12 to 14 billion years ago, the universe was a very hot, dense, tiny ball of matter. It expanded very rapidly to form the universe we know today.

The Universe is commonly defined as the totality of existence, including planets, stars, galaxies, the contents of intergalactic space, and all matter and energy.Similar terms include the cosmos, the world and nature.

The farthest distance that it is theoretically possible for humans to see, called the observable universe, is about 93 billion light years in diameter. Scientific observation of the Universe has led to inferences of its earlier stages. These observations suggest that the Universe has been governed by the same physical laws and constants throughout most of its extent and history. The Big Bang theory is the prevailing cosmological model that describes the early development of the Universe, which is calculated to have begun 13.798 ± 0.037 billion years ago. Observations have shown that the Universe appears to be expanding at an accelerating rate.


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