Space Facts: Part 8 - Birth of Universe, Cosmic Inflation

The Birth of Universe:

It is believed that before Big bang universe was a tiny point having infinite density and infinite temperature. Surrounding of that point was void, having no matter, no temperature and no time.

After Big-Bang (a great explosion from that singular point) the 'matter' spread in all directions at the speed of light. According to theory of relativity, if an object travels at a speed of light, time dimension for that object becomes zero. In other words time stops for that object. So within no time that minute zero dimensional point became an expanding universe. This expansion of Universe after Big-Bang is called Cosmic Inflation.

Now what is Cosmic Inflation Theory?

Cosmos means Universe and Inflation refers to Spread of Universe. Big-Bang theory does not explain from where that point universe came into existence and what happened after Big-Bang. Cosmic Inflation Theory explains what happened after Big-Bang.

Cosmic Inflation Theory starts when the speed of inflation decreased than speed of light. That's the reason why Big-Bang theory is explained in 3 dimensions but Cosmic Inflation Theory is explained in 4 dimensions. The 4th dimension is Time. Time started when universe was spreading with speed lower than the speed of light.

What Einstein thought on Cosmic Inflation?

Einstein compared the universe with balloon. Balloon inflates till we blow air in it and shrinks after reaching a saturation point. Using this assumption he gave his "Special Theory of Relativity".

But today most of the Astrophysicists believe that universe will not shrink and will keep on expanding. Recent discoveries also put light on theory, that universe is still expanding but an uneven expansion of Universe is taking place.

Although Einstein made some mistakes in his assumptions most of the equations given by his theory of relativity has proved to be true!!