6 minutes to take you on a journey through the universe known to man

It's good that you can have doubts here, which means that you have thought about it. In fact, the boundary he is talking about here is only a kind of horizon, not the real boundary of the universe. So what is the world of the universe?

In fact, we can't observe anything outside that boundary, which does not depend on the performance of the detector, but theoretically cannot be detected at all. The physical reason for this is because the age of the universe is finite, and so is the speed at which the speed of light travels. Assuming that the universe is now age t and the speed of light is c, then the farthest distance we can detect is CT, and the light emitted by the objects after it has not yet reached the Earth, so we cannot detect it.

It must be possible for mankind to detect it in the future. Let me explain the last sentence. You think about a question.

What was the world before the universe was big**? You can't find any evidence, because no one will have proof, all space and time start from the origin of the universe, and before that, space and time are meaningless, and I shouldn't even use "before" to describe it. That world may not have the nature of time and space.

Outside the universe, we can no longer speculate on its properties by any of the laws of physics known today, and in this case, since the objects of our study are all concentrated in the universe, then the "space" and "time" outside the universe are meaningless, and they may exist, but they are meaningless to us, so we do not think they exist.

The universe is bounded and boundless, just like the outer surface of the earth (if the inner surface of the universe is like the surface of the earth, it will have edges), there are limitations, but if you can't go through the boundary, if a light shoots out from in front of you in the universe, then it will come from behind you.

I believe that the universe should be boundless, beginningless, and infinite, so there is no such thing as a boundary problem. The universe already contains everything, and there is no question of internal or external, origin and extinction at all. The universe is infinite in space and has no beginning or end in time.

No matter which direction you go in, it should be endless and endless, and it cannot be blocked by anything, which is the infinite cosmic space. I think it's absurd to think that the universe is boundary, and if the universe is boundary, what is that margin? Is there no beyond the margins?

And since there are edges means that there will be edges, this question is actually difficult to justify, how can people who say that the universe has an end explain it? The only thing that makes sense is that the universe is infinite and infinite! The universe is mainly composed of infinite space, and the infinite space exists there for eternity, how can there be a question of formation and disappearance?

Matter in the universe can only be in an infinite cycle, endless and endless. It can be said that the infinite universe is indeed unimaginable to us, and it has long been beyond the scope of human cognition! The mysteries of the universe are endless, and the research and exploration of the universe by human beings is also endless!

This is the universe, a mystery that mankind will never be able to solve!

Strictly speaking, the theory of the universe itself is a hypothesis that is difficult to prove, and there are still many doubts that are difficult to justify. Therefore, it is difficult to say whether the universe has really happened, for example, the so-called singularity is a very absurd singularity, how big is this singularity? How long has it been around?

Why all of a sudden? I'm afraid no one can say, including the author of the theory. Therefore, the great ** doctrine of the universe is not perfect and cannot convince all people, so why should it be too serious!