1. Big Bang - Birth of Universe

Hello,

Question - How earth came to existence?

Answer - First, I thought this should be title of the first post. But before earth came to existence there must be something present that created earth. What was it? Yes, Universe.

Then i thought why not start with the birth of universe first.

Big Bang Theory -

                           There are quite a few theories about how universe came to existence. But the most popular and widely accepted theory is Big Bang Theory. According to Big Bang Theory universe was created nearly 14 Billion years ago. At first, universe was in a very hot and dense state. After that it began to expand rapidly. Then the energy converted into particles like protons, neutron and electrons. Then after hundreds of years neutral atoms were formed like hydrogen, helium and lithium. And these atoms combined and formed stars, galaxies.

           But how we can say that universe came to existence from Big bang?  Yes, we can't. It's just an scientific assumption based on the findings of an American astronomer Edwin Hubble. What he found out was that the Galaxies in the universe are moving away from each other or distance between them is changing with time.

           It means at some point they were close enough to make their distance from each other 0 and this means nearly 14 billions years ago something happened (we call this Big bang) that threw these galaxies in different directions and they are still moving away from each other. At first even Einstein and Sir Issac Newton assumed that universe is static. But Hubble proved his thesis by measuring approximate distance of some galaxies from Earth.

         There are lot of theories and explanations provided by scientist and astronomers about the birth of universe, its current state and state before big bang. I think that is lot of information to read but we need simple answers because we are not doing any thesis on creation of universe, are we? But of all these theories, the Big bang theory is widely accepted among scientists and astronomers.

       But still there are more interesting things about universe to tell. I will continue where i left off here in the next post. Don't forget to ask questions or leave comments. Cheers!!