Universe Origin Theories, Beginning, Evolution and Future of the Universe (BIG BANG Theory, Steady State Theory and Pulsating Theory)

What is the Universe

The universe can be defined as the totality of everything that exists that includes all matter and energy, planets, stars, galaxies and all the content that is present in the intergalactic space.

Origin of The Universe

Theories of Origin and Evolution of the Universe

Here we will discuss, 3 important theories put forward to explain the origin and evolution of the universe -
These theories are -
1. The Big Bang Theory
2. Steady State Theory
3. Pulsating Theory

Now let's discuss each of these theories in some detail-

The Big Bang Theory

The big bang theory was proposed by Le Maitre and Gammow. This theory says that the whole matter of the universe was once concentrated in an extremely dense and hot fireball at the beginning of the universe.
And then very big explosion occurred nearly 20 billion years ago. This big explosion was named "the Big Bang". This big explosion caused the matter to break into pieces. The highly concentrated matter was thrown out with high speed in all the directions that later formed stars and galaxies. These stars and Galaxies are still moving away from each other. Our Universe is expanding !!!

Steady State Theory of Universe

The steady state theory was developed by Bondi, Thomas, Gold German and Fred hoyle. According to this theory,
the number of galaxies in the observable universe is constant and new galaxies are being created continuously out of the empty space, which fill up the gaps caused by those galaxies which have crossed the boundary of the observable universe. So by this theory it can be concluded that the overall size of mass of the observable universe is constant therefore the steady state of the universe is not disturbed at all. Therefore this theory is named as steady state theory.

Pulsating Theory of Universe

Pulsating theory gives another explanation for the evolution of the universe. This theory states that the universe is pulsating, which means that our universe is supposed to be expanding and contracting alternatively. As now we know that our universe is expanding at present. This theory also accepts this fact that at the present time our universe is expanding but it will not keep on expanding all the time. According to this theory, at certain time it is possible that this expansion of the universe will be stopped and then it will start contracting due to the gravitational pull. With the time this contraction will come to a point where the explosion of the universe again take place and again the expansion of the universe will start. So in this way this alternate expansion and contraction will be continued in the pulsating universe.

So these 3 theories explain the beginning and evolution of the universe in different ways. The "Big Bang" theory says- Our universe is expanding and will keep on expanding, while the another theory "Steady State theory" proposes that the overall size of mass of the observable universe is constant. But according to the third theory "Pulsating Theory", the universe will alternatively expand and contract !!!

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