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Big Bang Theory Timeline

A brief timeline on some of the events that happened during The Big Bang and discoveries regarding The Big Bang
by

Paige Derossett

on 6 June 2013

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Transcript of Big Bang Theory Timeline

Big Bang Events Event Evidence Big Bang Nucleosynthesis occurred between 3 and 20 minutes after the Big Bang happened. This period of time is responsible for the elemental production of hydrogen, deuterium, helium and its varieties, and the isotope of lithium. In this period, the temperature dropped enough to make the production of these elements possible, the protons and neutrons combining with the atomic nuclei produced. The free protons and neutrons combined to form deuterium. When the temperature dropped even further in in the next seventeen minutes, then Nucleosynthesis no longer became possible. Also, the universe was expanding, making the chances of collision smaller. The Big Bang Happens Some 13.8 Billion Years Ago The Hadron Epoch occurred between 10-6 (to the negative 6th power) and one second after the Big Bang. The plasma making up the universe cooled enough to the point where hadrons can form, such as protons and neutrons. Then, at one second after the Big Bang, the neutrinos start to flow freely through space. At the end of this period, the hadrons and anti hadrons annihilate each other. Makes These Leptons and Anti - Leptons dominate the majority of the universe during the Lepton Epoch after the Hadrons were annihilated in the Hadron Epoch. At ten seconds, the temperature drops so that the Leptons can no longer form. The Leptons and Anti Leptons annihilate each other just like in the Hadron Epoch. Death to Leptons! This Happens The Photon Epoch occured between 10 seconds and 380,00 years after The Big Bang. After Nucleosynthesis, the universe continued to expand, the Photons and matter becoming more spread out. After the Photon Epoch, Photons could no longer make use of themselves, so the universe became transparent. That's where we get Cosmic Background Radiation from. Starting from
The 1900's Hubble's Law was founded in 1929 by Edwin Hubble. Hubble found that all the galaxies appeared to be moving away from us after charting them with his assistant. This means that if they go forward, they had to have gone back at some point. And they would have gone back as far as to converge at one point. This is considered one of the main evidences of The Big Bang Theory. In 1964, Cosmic Background Radiation was founded while Arno Allan Penzias and his partner, Robert Woodrow Wilson, were working on one of their most treasured antenna/reciever systems. They heard a strange noise and after ruling every possibility out, they discovered that their was pigeon dung in the horn of the system. So they removed the dung and shot the pigeons, but the noise still remained. That is because Cosmic Background Radiation is the radio remnant of the Big Bang. Nucleosynthesis is both a time period within the Big Bang and a piece of evidence. While nucleosynthesis is a process of element production, it also accounts for a lot of things we rather could not. Nucleosynthesis explains where Deuterium came from and why there is more helium in old stars that's not accounted for by stellar nucleosynthesis. Along with more observations, Nucleosynthesis just makes sense in the Big Bang Model. 1929 1964 Less Than One Second After The Big Bang One to Ten Seconds After The Big Bang Between 10 Seconds and 380,000 Years After The Big Bang Between 3 and 20 Minutes After The Big Bang CMBR During the Lepton Epoch and Nucleosynthesis, Matter Domination occured. This period of time is exactly what it sounds like. Matter dominated the universe. But this matter domination makes gravitational collapse possible, and eventually actual structures too. 70,000 Years After The Big Bang Helium and Hydrogen atoms begin to form and are at first ionized. When the universe cooled, the ions captured these atoms and formed neutral atoms. This is called Recombination and started to happen 377, 000 years after the Big Bang. Recombination also contributed to Cosmic Microwave Background Radiation. Does That! 377,000 Years After The Big Bang Galactic Evolution and Distribution is the evidence that the galaxies, quasars, etc. are in alignment with where they would be according to the Big Bang and simulations that scientists have done. That is, where the galxies were supposed to have moved according to Hubble's Law, they did. But the way these structures are formed also make sense with the Big Bang Theory. Promordial Gas Clouds were discovered that have nothing heavier than helium detrium in them. Other astrinomical objects have heavy materials in them, being formed by stars. The Big Bang didn't produce heavier elements itself, so the clouds had to be from some earlier time period in the Big Bang. Most likely nucleosynthesis since the composition matches. 2011 2007 THE END Note: Most information is taken from N.A.S.A. or Hubble sites as well ask Wikipedia. All information was paraphrased or summarized.
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