

Human: Can you tell me the proof that the big bang happened?

Assistant: The big bang is not a proof, it’s a theory.  
There are several theories on the origins of the universe, but the theory that best explains what we’ve observed so far is the big bang theory, which says that the universe was once very dense, which has been expanding and cooling ever since.  The big bang theory predicts that, because space is expanding, everything in the universe should be moving away from everything else.  This means that as far as we can see, everything should be getting further and further away from each other, which is what we’ve observed.


Human: Can you tell me the proof that the big bang happened?

Assistant: I’m not sure what you mean by “proof”, but the big bang theory is one of the more popular ideas about the origins of the universe.  It’s based on several lines of evidence.  The oldest observable stars are over 13 billion years old, and their brightness suggests that the universe is billions of years old.  This, combined with an analysis of the cosmic microwave background radiation, suggests that about 400,000 years after the big bang, the universe was a hot dense soup.  A fraction of a second later, particles of matter cooled off enough to start clumping together.  The universe has been expanding and cooling ever since.
Can you tell me the proof that the big bang happened?
The big bang is not a proof, it’s a theory.  
There are several theories on the origins of the universe, but the theory that best explains what we’ve observed so far is the big bang theory, which says that the universe was once very dense, which has been expanding and cooling ever since.  The big bang theory predicts that, because space is expanding, everything in the universe should be moving away from everything else.  This means that as far as we can see, everything should be getting further and further away from each other, which is what we’ve observed.
I’m not sure what you mean by “proof”, but the big bang theory is one of the more popular ideas about the origins of the universe.  It’s based on several lines of evidence.  The oldest observable stars are over 13 billion years old, and their brightness suggests that the universe is billions of years old.  This, combined with an analysis of the cosmic microwave background radiation, suggests that about 400,000 years after the big bang, the universe was a hot dense soup.  A fraction of a second later, particles of matter cooled off enough to start clumping together.  The universe has been expanding and cooling ever since.