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Big Bang Theory

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by

Justin Jimenez

on 8 July 2013

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Transcript of Big Bang Theory

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli
Father of Big Bang Theory
George Lemaitre
What is the Big Bang Theory
Big Bang Theory
Evidences of Big Bang Theory
The Hubble's Law
Evidences of Big Bang Theory
Evidences of Big Bang Theory
Light Elements
Some Weakness of Big Bang Theory
Magnetic Monopoles
According to the Big Bang theory, the expansion of the observable universe began with the explosion of a single particle at a definite point in time. This startling idea first appeared in scientific form in 1931, in a paper by Georges Lemaître, a Belgian cosmologist and Catholic priest. The theory, accepted by nearly all astronomers today, was a radical departure from scientific orthodoxy in the 1930s. Many astronomers at the time were still uncomfortable with the idea that the universe is expanding. That the entire observable universe of galaxies began with a bang seemed preposterous.
The Big Bang theory is an effort to explain what happened at the very beginning of our universe. Discoveries in astronomy and physics have shown beyond a reasonable doubt that our universe did in fact have a beginning. Prior to that moment there was nothing; during and after that moment there was something: our universe. The big bang theory is an effort to explain what happened during and after that moment.
Galaxies appear to be moving away from us at speeds proportional to their distance. This is called "Hubble's Law," named after Edwin Hubble (1889-1953) who discovered this phenomenon in 1929. This observation supports the expansion of the universe and suggests that the universe was once compacted.
Cosmic Microwave Background radiation
The universe was initially very, very hot as the Big Bang suggests, we should be able to find some remnant of this heat. In 1965, Radio astronomers Arno Penzias and Robert Wilson discovered a 2.725 degree Kelvin (-454.765 degree Fahrenheit, -270.425 degree Celsius) Cosmic Microwave Background radiation (CMB) which pervades the observable universe. This is thought to be the remnant which scientists were looking for. Penzias and Wilson shared in the 1978 Nobel Prize for Physics for their discovery.
The abundance of the "light elements" Hydrogen and Helium found in the observable universe are thought to support the Big Bang model of origins
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The problem of magnetic monopoles is also solved by inflation
Full transcript