The Big Bang
The theory of the Big Bang (also called Big explosionnote 1) is the predominant cosmological model for the oldest known periods of the universe and its subseque...
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The theory of the Big Bang (also called Big explosionnote 1) is the predominant cosmological model for the oldest known periods of the universe and its subsequent large-scale evolution.2 3 4 It states that the universe was in a state of very high density and then expanded.5 6 If the known laws of physics are extrapolated beyond the point where they are valid, we find a singularity. Modern measurements date this time approximately 13.8 billion years ago, which would be the age of the universe.7 After the initial expansion, the universe cooled sufficiently to allow the formation of subatomic particles and later simple atoms. Giant clouds of these primordial elements joined later due to gravity, to form stars and galaxies. In the mid-twentieth century, three British astrophysicists, Stephen Hawking, George F. R. Ellis and Roger Penrose, paid attention to the theory of relativity and its implications for our notions of time. In 1968 and 1979 they published articles in which they extended Einstein's theory of general relativity to include measurements of time and space.8 9 According to his calculations, time and space had a finite start corresponding to the origin of matter and energy.
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Jan, 2018Views
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