The Universe has its own complexities that most astronomers managed to understand. They even proved them, although they still don't know how exactly the Universe began. In this post I'm going to focus on a theory called The Big Bang which is, in my opinion, the most likely.
The Big Bang took place a very long time ago, that means around 13.8 billion years. Back then, space and time didn't exist. There was just a tiny point of infinite density which consisted of all the future matter and forces of the Universe. Astronomers use to call it "Singularity". The temperature in that point was incredibly high.
Afterwards, Singularity started to expand really fast. Time and space were born. It all happened in a fraction of a second. During the expansion the temperature and density became lower. Small elementary particles started to form. Finally baryonic matter came into existence. It's the matter that we know today - made of protons, neutrons and electrons.
Several billion years later atoms began to get closer to each other with the help of gravity. These particles formed planets, stars and galaxies.
I'm sure you've heard about The Big Bang before but you probably think it's just a speculation. However, there is evidence for that theory, such as the fact that the Universe is expanding (galaxies are moving away from each other), so there must've been a time when everything was situated in a single point. Another instance of proof that The Big Bang really took place is the existence of Cosmic Microwave Background Radiation which I'm going to write about in the next post.
I summarized everything that I've read but if you want to know more, you can look at the source: https://www.universetoday.com/54756/what-is-the-big-bang-theory/
If the initial expansion of the universe happened so quickly (fraction of a second) why isn't the universe expanding equally fast now? Or is it?
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