# Creation of Universe in Brief

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I thought that the first post of this blog should be about the creation of universe. The theory which explains the creation of universe and which is an accepted theory of the creation of universe is the Big Bang Theory.
According to this theory, our universe may have come from a singularity. Singularity may be defined as a point in space-time with infinite density and it’s is infinitely small. It has infinite density because:
Density = Mass / Volume.
And the volume of singularity = 0 (because of having zero size),
so,
Density = Mass / 0
⇒ Density = Infinite (because when any non zero number is divided by 0, the result is infinity)
This theory, that a universe may have come from a singularity, was proved by Professor Stephen Hawking and Sir Roger Penrose in 1965.
According to the Big Bang theory, the singularity may have started to inflate due to some reason (the reason is not known still). The universe, initially, started to expand with a speed greater than light (this may violate Einstein’s Special Theory of Relativity). This process when space-time expanded with a speed greater than light is called cosmic inflation or eternal inflation and this idea was presented by Alan Guth in 1981.
The universe was completely filled with energy and in a very small fraction of a second, much of the energy converted into mass (matter). Mass is nothing but very dense or concentrated form of energy, and, both energy and mass are inter-convertible.
There were only elementary particles (the fundamental and indivisible particles like quarks, electrons etc.) in the early universe moving near to speed of light. But there was not only matter and energy in the early universe, there was also ‘antimatter’. when a particle of antimatter collides with a particle of matter, they both vanish producing high energy. But the estimated ratio of particles of matter to particles of antimatter was (1 billion 1) to (1 billion). This means that for every (1 billion 1) particles of matter there were (1 billion) particles of antimatter. So, finally, matter won.
These events, described above, took place in only 1 second!
The elementary particles were moving with a very high velocity (speed), so they couldn’t form atoms and stars etc.
But after about 300 thousand years, when the particles started to lose energy and there energy started to decrease, then, they started to form atoms of hydrogen, helium, lithium and ‘heavy hydrogens’ called deuterium and tritium. All the other elements like Oxygen, Gold and Silver etc. are formed inside a star by process of ‘nuclear fusion’. Star is nothing but a very dense ball of hydrogen and helium gases.
The events that took place after the Big Bang explosion can be understood by the images below:

Hope You Liked It.