Quasi-clean universe: there is no mystery. Why are atoms, electrons and photons similar but galaxies different?

At the microscopic level, matter is very accurate. There are countless oxygen molecules in the air, and the difference between any two oxygen molecules is very, very small, which can basically be considered as similarity, not to mention atoms, electrons and photons. However, the differences between galaxies are very, very large. The distribution environment of galaxies is quite different, and the quality spans nine levels. Some of them are distributed in a relatively dense environment, and some can be an isolated system. Why is this?

This problem is related to our understanding of the universe and the correctness of our physical formula. For example, some photons are fast and some photons are slow; Some photons will be disguised at will, and some photons will not be disguised at will; How reasonable. If there are quarks on quarks, it is reasonable for them to develop science and technology and then transform this quark so that the quarks they live in are different from other quarks. We live on the earth and then transform it, which makes the earth different from other planets, so why can't quark people?

If there is a unified theory, then the most basic particles of the unified theory should be exactly the same. However, if exactly the same particles do not exist, how can this theory be unified? We need to think about at what level the matter in the universe is the same. Since there are great differences between galaxies, can we expand it to another level? For example, the visible cosmic ball is an electron, and its mass is strictly equal to that of other cosmic balls. Once such a level is found, a complete node is formed from the quark layer to the sphere layer of the visible universe. The smallest layer is the same, and so is the largest layer. We are the details in the middle.

It is precisely because of the similarity of microscopic particles and the difference of macroscopic substances that there are still many things we don't know. As long as the microscopic particles are identical, the macroscopic matter is identical, and we, as the microscopic ones in the macroscopic matter, cannot change the macroscopic matter itself, so it is reasonable to construct such a universe.

This is really a difficult problem.