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big bang imaginary a
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B!G Bang Theory

We(human) are living on a planet named EARTH. Our planet is a member of the SOLAR SYSTEM, which a minute part of our GALEXY (Milkyway). Millions such galexies combingly forms the UNIVERSE.
Now question of a que. Is.. HOW THIS WHOLE UNIVERSE BEGIN? & HOW LONG BEFORE??
Well.. BIG BANG THEORY is an ans. to above questions.
Big Bang Theory refers to the idea that, The universe has expanded from a primordial hot & dense point at some finite time in past & expanding to this moment.

According to Big Bang Theory Universe has started about "13.7 Billion" Years ago with a giant explosion at very hot and dense point
In the earliest phase of Big Bang, the universe fillied homogeneously & isotropicaly with an incredibly high energy & density and was rapidly expanding & cooling. Approximately after 10^-37 seconds after an explosion a phase transition caused a "COSMIC INFLATION" during which universe grew exponentialy.
After inflanation stoped, the universe constisted of all 'ELEMENTRY PARTICLES' ( Matter_Anti- matter). The high temp. at this stage were causing continuous creation and destruction of particles and anti-particles due to collision.
The universe continued to grow in size and fall in temp.
After about 10^-6 seconds of explosion, Quark & Gluons ( subatomic particles) combined to form proton, nuetrons & electrons.

Few min. later, when temp. Was about 1 billion kelvin & density was about that of air, neutrons combined with proton to form a HELIUM (He) nuclei. Most proton remained uncombined as HYDROGEN (H2) nuclei.
After about 379,000 years, the electrons & nuclei combined into an atom.

For long period of time, the slightly denser region gravitationaly attracted nearby matter and thus grew even denser forming Gas clouds, Stars, Galexies & other astronomical structure.
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