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 !!!