Question

Describe the discovery of the Big Bang.​

Answer 1

Answer:

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The Big Bang is a scientific theory about how the universe started, and then made the stars and galaxies we see today. ... It was Georges Lemaître who first noted (in 1927) that an expanding universe could be traced back in time to an originating single point.

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Answer 2

Answer:

The Big Bang theory is a cosmological model of the observable universe from the earliest known periods through its subsequent large-scale evolution. The model describes how the universe expanded from an initial state of very high-density and high-temperature, and offers a comprehensive explanation for a broad range of observed phenomena, including the abundance of light elements, the cosmic microwave background (CMB) radiation, large-scale structure, and Hubble's law – the farther away galaxies are, the faster they are moving away from Earth. If the observed conditions are extrapolated backwards in time using the known laws of physics, the prediction is that just before a period of very high density there was a singularity. Current knowledge is insufficient to determine if the singularity was primordial.

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