According to the Big Bang theory, everything in the universe now comes from the Big Bang 65.438+038 billion years ago. And before the formation of the universe, time and space did not exist. It can be said that BIGBANG is the real "creator".
Before BIGBANG, there was a point that existed and did not exist, a point with infinite mass, infinite density and wireless temperature, which is what we often call a singularity. Singularity cannot be calculated by modern physical formulas, and all physical laws are invalid at singularity. This magical singularity broke out 138 billion years ago and expanded rapidly in a very short time. How fast? Every billionth of a second, space expands 1000 billion times. For example, the universe expanded from the size of a hydrogen atom to the size of a baseball in less than a billionth of a second, and from the size of a golf ball to the size of the earth in the same time!
At the moment of the Big Bang, a large amount of energy and matter burst out and expanded outward at an alarming rate.
During the explosion, a lot of energy and matter are ejected from the singularity. After the "expanding" universe cooled rapidly, particles in space began to synthesize. First quarks condense into protons and neutrons, and then protons and neutrons gather together to form nuclei. The earliest nuclei in the universe are hydrogen nuclei and helium nuclei.
Quarks synthesize protons and neutrons.
Hydrogen nucleus and helium nucleus
After 380,000 years, electrons joined them to form atoms, which are still mainly hydrogen and helium.
= hydrogen atom and helium atom with electrons
After 400 million years, under the action of gravity, hydrogen began to gather together, forming primitive stars and galaxies.
A nectar-like protogalaxy
Later, after a long evolution of1300 million years, the universe became what it is now. If you use a picture to represent this process, as shown below:
The whole process of the universe.
-The above content is taken from Millay's children's book A Brief History of Life.