Origin of Universe - The Big Bang theory

Big bang first explained by Georges Lemaître in 1927. Big bang is a idea how our universe , milky way galaxy , solar system and our beautiful blue planet earth originate. Before big bang many theory attempted to explain origin of universe, but they did't present strong proof, Big bang is most accepted theory. Some of them are :-

1. Theory of spontaneous generation

According to this theory , life comes from decaying and rotting matter like straw , mud etc.

2. Theory of panspermia

According to Early Greek thinker unit of life (spores) were transferred to different planet.

What is Big bang?

According to Georges Lemaître , 13.8 billions years ago universe started as a single point. He also said universe is expanded to get as big it is now and keep expanding.

More about Big Bang

Just two year later , a astronomer Edwin Hubble noticed that some other galaxy , and planets moving away from us. This means universe still expanding according to lemaitre.

Today what we see planet , sun , comet , asteroids , stars they were not not from beginning and not as such. Universe is originated from hot , tiny partical mixed of light and energy. The tiny partical groped to form atom , group of atom called molecules and group of atoms combined several time to form stars and galaxies . According to recent study universe is expanding as faster than light travel (speed of light = 3×10^8 m/s).

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