Universe:
The most widely accepted theory about origin of the universe is Big Bang. The Big bang theory states that the universe began in a state of extremely high density and a volume approaching just a point. Then the universe has been expanding since some particular instant that marked the origin of the universe. Tracing the expansion of the universe back in time shows that the universe would have been compressed to infinite density approximately 10^-20 x 10^9 (10 raise to power -20 multiply by 10 raise to power 9) years ago. The universe began at that time as a Big Bang the expansion. The Big Bang the expansion. the Big Bang was the origin of space and time. It is tempting to think of Big Bang as something like the explosion of an artillery shell. but it is more correctly an expansion of space itself, filled with hot radiation and matter.
Between 10^-43 and 10^-35 second after the big bang, the universe was extremely hot and the particles were exerting upon one another the single, strong-weak electromagnetic force. Due to high energy, quarks and electrons present at that time were interchangeable. Quarks are the most fundamental particles discovered which combine to form protons and neutrons. The temperature of universe at that time was 100,00 million degree centigrade(°C). From 10^-35 to 10^-10 second of the big bang, the universe was cooling and the strong electromagnetic-weak forces were functional distinctly between quarks. Quarks are strong were no longer interchangeable. String like concentrations appeared around which future galaxies were to be formed.
After 10^-10 to 10^-5 second of the moment of creation, the hot radiation continue to cool down and three forces: electromagnetic, strong and weak became differentiated. After the end of this era, quarks started coming together to form protons, neutrons and other subatomic particles were formed. Then starting from 10^-5 second, the commonly known particles were formed. Quarks had combined to form protons and neutrons. However, the universe was too hot allow the particles to combine in the form of atoms and atomic nuclei. The collisions of high energy particles would have knocked any nucleus trying to assemble. Electrons, protons, neutrons, neutrinos and anti-neutrinos were involved in atomic activity characteristics of the particles.
By about three minutes after the big bang, the temperature of the universe was dropped enough that protons and neutrons were able to collect to form atomic nuclei. The temperature was, however, too high for the formation of atoms or elements. The electron going around the atomic nuclei would have been knocked to go to astray, leaving the orbit. By about 500,000 years after the big bang, the temperature was low enough to form complete atoms. Radiation assemble in the form of galaxies and stars. After the formation of atoms, the matter started condensing to form early planetary bodies. These cosmic bodies would interact with one another through force of gravity. More matter was condensed to make nuclei for the formation of galaxies.
By about three minutes after the big bang, the temperature of the universe was dropped enough that protons and neutrons were able to collect to form atomic nuclei. The temperature was, however, too high for the formation of atoms or elements. The electron going around the atomic nuclei would have been knocked to go to astray, leaving the orbit. By about 500,000 years after the big bang, the temperature was low enough to form complete atoms. Radiation assemble in the form of galaxies and stars. After the formation of atoms, the matter started condensing to form early planetary bodies. These cosmic bodies would interact with one another through force of gravity. More matter was condensed to make nuclei for the formation of galaxies.
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