The Big Bang was the start of the Universe really. The Big Bang happened according to scientists, 13.7 billion years ago. After The Big Bang it cooled and created sub-atomic particles. Although it took some thousands of years to make a universe, it first produced hydrogen, helium, and lithium. They would then have produced dust clouds and formed gravity! Even though this is a (successful) scientific theory. It is the only explanation we know on how the universe happened. Through more and more time, we will find out more on how the universe started.
This is perfect. I like that you noted that we haven't found everything there is to find and we will learn more in the future.
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