So as the insanely catchy theme song for the sitcom "Big Bang Theory" states, the whole universe started in a hot dense state. Then, everything had changed. Because it is impossible to try and recreate the big bang in a lab, scientists can only theorize about what had happened. This theory came to be because of the Hubble telescope. Through this telescope, scientists were able to see that entire galaxies were moving away from us at a very rapid speed. The explosion from the big bang could have only been the only thing that would have caused that. The most amazing thing is that the explosion was only there for a very short time. In fact it only took about one second for the building blocks of the universe to form.
This picture calls that the Big Freeze Out. Then, 12-15 billion years later, our Universe as we see it today is in existence.
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