by Kirti Tomar (B.Sc final year)
Indira Gandhi National Open University (Jamia Milia Islamia)
BIG BANG- Before the big bang we mean a time 13.8 billion years ago when all the material that makes up the observable universe came into being in the form of a hot, dense plasma of elementary particles. Before this time, the universe was very different. It was relatively cold and devoid of Particles and space itself was expanding very rapidly, which means that any particles it may have contained were moving away from each other at high speeds.