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Evidence, scientific models, simulations, observations, etc. In a way we didn't discover the Big Bang, we made it.
Using known science and the many laws that govern various fields, as well as observations like that the universe is expanding, the visual evidence of the cosmic background radiation, simply the ability to look into space and see back in time, among other things, we can put it all together into theories. The best theory of which is the Big Bang theory.
In the 50s, there were two theories answering the question. The nascent Big Bang theory and the popular steady-state theory. Then in 1965 the cosmic background radiation was discovered, which the Big Bang theory predicted, and the steady-state theory was essentially dead because it had no solution to the existence of the CMB.
Under the known laws of physics, simply the best answer to how this universe began is the Big Bang. In this day there are scientific fields devoted just to various aspects of the Big Bang itself; for example, Big Bang neucleosynthesis (The creation of atoms heavier than hydrogen-1). That's not to say the Big Bang theory is correct, it is a theory with its own problems after all, it's just the most likely one at this time.
What else can I help you with?
Did ptolemy use the big bang theory?
No. The Big Bang theory came a lot later.
When did Earth from?
it came from god or if you scientific it came from the big bang
What do scientises tell us the big bang happend?
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
Where did Neptune come from?
Neptune came from the big bang like the rest of the planets it was formed by all of the gasses that were let off when the big bang happened.
What is the big bang theory density?
The Big Bang Theory states that the entire Universe came into being after rapidly expanding from a singularity of infinite density.
Where does everything derive from?
In our Universe, ultimately everything started with the Big Bang. We don't know what came before that... or if there even was a "before".
What was made during the big bang?
Within ten seconds of the start of the Big Bang, all hadrons and leptons that now reside in our Universe came into existence.
Does your body contain atoms which were once made in the Big Bang?
Atoms did not come into being until Recombination, which occurred about 377,000 years after the Big Bang. Hadrons and leptons -- the building blocks of atoms -- came into being about ten seconds after the Big Bang. All matter came, ultimately, from the Big Bang (as best we can presently tell). Thus, the atoms in your body -- as well as atoms 100 billion light years away from us -- came from that source.
How do scientists think planets came to be?
They say it all had to do with the Big Bang Theroy!
Why universe exists?
Because God created it (or perhaps ordered it to be created). If you want a more scientific explanation: the Universe as we know it was the result of the Big Bang. What came before the Big Bang - or the exact cause of the Big Bang - are currently unknown.
From where energy came into the universe?
Energy and space and time all came into existence when the universe was created. It happened when the Big Bang happened 13.7 billion years ago. We have no scientific understanding of anything before the Big Bang.
How did the big bang come into existence?
When Matter and anti-matter collided the Big Bang came into existence. But something still remains a mystery that how did the Matter and anti-matter come.
