What is big bang theory?
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Answer:
According to most astronomers, the universe started with a gigantic explosion-the Big Bang- of a cosmic egg about billions of years ago. Atoms and later molecules were formed as a result of this explosion. They ultimately formed a giant cloud of gases and tiny dust particles called the nebula. The nebula had a spinning motion and its own gravity. Fragments of the nebula were attracted to one another and collided at tremendous speed. This gave out enormous amount of heat which resulted in growth of glowing bodies like stars.
This is the BIG BANG THEORY.
The Big Bang theory offers a comprehensive explanation for a broad range of observed phenomena, including the abundance of light elements, the CMB, large scale structure, and Hubble's Law. According to The Big Bang Theory is a scientific model that describes how the universe began with a giant blast of matter and energy about 14 billion years ago. Right after the explosion our universe began to cool and expand, and eventually atoms, stars, galaxies and solar systems formed.