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Facts about the Big Bang theory?

Updated: 8/17/2019
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13.7 billions years ago, there was a singularity. (matter that is infinitely small, infinitely hot and infinitely dense. Scientists doesn't know how this "singularity" appeared.) Suddenly, it began to expand very fast and to cool down. The universe consisted of quark-gluon plasma and other elementary particles. Temperatures were so high that the random motions of particles were at relativistic speeds, and particle-antiparticle pairs of all kinds were being continuously created and destroyed in collisions. Baryogenesis (production of an asymmetry between baryons and anti-baryons) leaded to a very small excess of quark and leptons over anti-quarks and anti-leptons. (That's why we have more matter than antimatter in the universe) The Universe continued to grow in size and fall in temperature. Quarks and gluons combined to form baryons such as protons and neutrons. The temperature was now no longer high enough to create new proton-anti-proton pairs. There was a mass annihilation (destruction) that leaved

1/10 000 000 000 of the protons and neutrons, and none of their antiparticle. A similar process happened for electrons and positrons. A few minutes later, neutrons combined with protons to form deuterium (heavy hydrogen) and helium nuclei. After about 379 000 years the electrons and nuclei combined into atoms. Over a long period of time, the slightly denser regions of the nearly uniformly distributed matter gravitationally attracted nearby matter and grew even denser, forming gas clouds, stars, galaxies, etc.

astronomers found that the universe was expanding. So, they putt forward a theory to explain about when the universe was originated. They believed thaat about 15 billion years ago , all the matter in the universe was gathered into a single mass.Suddenly the mass exploded, sending particles flying in all directions.``````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

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Q: Facts about the Big Bang theory?
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