What is Big Bang ?

What is Big Bang ? – Scientists at the world’s largest atom smasher said they had succeeded in recreating conditions shortly after the Big Bang by switching the particles they use for collisions from protons to much heavier lead ions. The Large Hadron Collider recorded its first lead ion collisions and has since stabilized the twin beams sufficiently to start running physics experiments. The collisions produce an effect that is as close as researchers have ever come to observing the state of matter moments after the formation of the universe, which is believed to have begun with a colossal explosion known as the Big Bang.