How This Universe Was Created?

Everything in this universe has a beginning. But what about the beginning of the universe itself?  Well, this question was bought into the realm of science several decades back and the answer is worth learning. An American astronomer ‘Edwin Powell Hubble’ played a crucial role in establishing the fields of extra galactic astronomy and observational cosmology. His observations suggested that there was a time called the big bang when the universe was infinitely small and infinitely dense.

The big bang theory states that the universe began as a hot and infinitely dense point, only a few millimeters wide. It was similar to a super charged black hole about 13.7 billions of years ago.

This tiny singularity violently exploded and from this bang all the matters, energy, space and time was created. This was followed by two major stages of universal evolution called radiation and matter era.

RADIATION ERA - 

The period in the early universe, lasting from roughly 20 seconds to 10^{5 .}

MATTER ERA -

The Matter era one in which matter acts pretty much as it does now.  It began 300 to 500 thousand years after the Big Bang, when the temperature of the background radiation had dropped to around 3000 degrees K, cooler than the surface of the sun, but still hot enough to melt and vaporizes most substances. 

If there were events earlier than this time, then they could not affect what happens present time. Their existence can be ignored because it would have no observational consequences.

One may say that time had a beginning at the big bang, in the sense that earlier times simply could not be defined. It should be emphasized that this beginning in time is very different from those that had been considered previously. There is no physical necessity for the beginning of the time.