According to the scientists big bang is the main reason of the creation of this universe. after the big bang only the matter space and time came into being
No, there is not.
The Big Bang Theory tells what happen at the begning of the universe. How the Earth comes into the universe
The concept of "before" the Big Bang is not well-defined as time as we know it began with the Big Bang itself. It is thought that the entire universe was in a hot, dense state at the moment of the Big Bang, with all matter and energy concentrated in a singularity.
According to the believes of physics and the big bang, we know that the big bang was both big and a bang. Since we are still receiving radiation from the big bang, So considering that factor I would say that it was big and a bang. What do you believe?
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I have no idea what you're talking about.
They didn't; the big bang theory is just an idea or a theory, not a fact. The empirical evidence that our Universe was, 13.7 billion years ago, much more dense that it is now, is overwhelming. No other explanation even begins to explain what we observe in our Universe. Saying the Big Bang is a "just an idea or theory" is like saying gravity is "just an idea or a theory, not a fact."
How did it what? - It isn't known what caused the Big Bang, if that's what you mean.
The big bang created itself.
big bang: This is the big bang theory
Right after the big bang happened, the universe was expanding at a speed of light. While it was expanding, it started to cool itself down since the big bang caused the universe to heat up to ridiculous temperature.