The observation that the Universe is expanding leads us to the conclusion that it was formed around 13.5 billion years ago in an event we call the Big Bang which created all the matter in our Universe.
The generally accepted idea is that over 13 billion years ago all the energy and matter of the universe started off in a very small dense point called a singularity. Which over time expanded into the universe we know of now – starting with subatomic particles to particles onto galaxies and planets. Scientists worked this out by looking at the the Universe now and working backwards.
Prior to the singularity is still a mystery.
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