1. All the galaxies were appearing to move away from us. Further, farther they are faster they appear to move.
2. Cosmologists, scientists who study the structure and evolution of universe that is cosmos, reason that this imply at one point of time in the past all matter was confined in a single point and since then it has started to expand.
3. The event when the matter confined in a single point and began to expand is called ‘big bang’.
4. This is considered as the origin of our universe as we know it.
5. The Big Bang Theory is the prevailing model of the evolution of the Universe.
6. Under this theory, space and time emerged together about 14 billions of years ago.
7. At that time, the entire Universe was inside a bubble that was thousands of times smaller than a pinhead.
8. It was hotter and denser than anything we can imagine.
9. Then it suddenly expanded. The present Universe emerged.
10. Time, space and matter all began with the Big Bang.
