What was the beginning of Universe?

In the beginning, the Universe was nothing but a Singularity. A singularity is a point of infinite mass & density. Singularity seems stable as we study it today, but in the early universe because of quantum fluctuations, it wasn't stable at all. That instability resulted in a huge explosion we call Big Bang.

From our current understandings of Big Bang, Time or even Space didn't exist before the Big Bang, everything started altogether with this explosion. In the beginning, the Universe was like a very hot soup of pure energy having all the ingredients required for the formation of atoms.

What was the beginning of universe?

Within a few microseconds after Big Bang particles like quarks, leptons, gluons, Higgs, etc came into existence. But since the universe was expanding & cooling at a fast rate, these particles started to coalesce & formed other fundamental particles like electrons, protons & neutrons. But Universe was still expanding & cooling down, so the fundamental particles came along & made up the atoms (mostly Hydrogen & Helium).

What was the beginning of universe?

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