My understanding of the universe?

Before the birth of the universe, there was no time, space, matter and energy. Nothing, but at that moment, an explosion, everything was born.

This is a process from scratch. Before that, there was nothing.

Some people may ask, starting from scratch is an illogical thing and impossible. That's what I thought at the time.

Later, I accepted that all the laws in our life are laws in the universe. And the birth of the universe, why must we abide by this law?

If you can't accept my idea, then you can relax, empty your mind and simply think that the universe was born from scratch at such a moment. Or, you can try to compare your ideas from scratch, or a work of art, and so on.

The birth of matter and energy in the universe.

Have you ever tried to think about where every atom in your body, the flowers and trees around you, and your lover come from?

They all came from the birth of the universe. At that moment, all the energy and matter in the universe were born.

In a short time after its birth, much shorter than subtlety, the universe expanded to the size of the solar system, and then expanded continuously, becoming as big as it is now.

How big is it?

Please close your eyes and imagine how big the universe is in your heart.

Then the universe you imagine is probably as big as the Milky Way.

When you look up at the starry sky, your eyes are probably at the end of the Milky Way.

According to people's estimation.

The Milky Way has 200 billion to 600 billion stars and a large number of clusters.

20000000000000000, well, here it is.

The universe has 1000 billion to 200 billion galaxies similar to the Milky Way.

Another order of magnitude, right? If you think again that there are 500,000 planets in the solar system, there is a bigger and farther space between the two galaxies, just like between the earth and Mars, a bigger space close to vacuum.

Do you suddenly feel how small you are?

The shining stars you look up are all stars like the sun, that is, every star you see is a solar system.

Some students may know the periodic table of elements, and these elements will become more and more rare in the future, but why?

All these elements are born in stars like the sun. You can imagine the stars as a kitchen, from which you can make all kinds of meals (new elements). The collision of hydrogen and hydrogen produces energy, which burns the sun and produces helium at the same time.

When the sun burned out, after a series of changes, some exploded, releasing these new elements into the universe again. They wandered in the universe and one day formed you and me. And some of them become black holes, sucking everything around them, endless darkness.

There is a saying that when the universe expands to a certain extent, it will shrink and become a point again. Without length and width, every element that once constituted our body will reunite. And then explode again.

How like a reincarnation.