What is beyond the boundaries of the universe?

First of all, the limitations of thinking and cognition will lead us to a dead end, and finally the problem will rise to the level of "philosophy" and become a complete paradox. It's as if ancient humans had such a question: If you go all the way along the earth, will you go to **?

Is it the end? What's beyond the end? <>

Today, when we look at this kind of question of the ancients, it feels ridiculous, and we think that there should be no such question. But one thing is for sure, if you lived in ancient times, you would have the same doubts as the ancients. The reason why we no longer have any doubts about the question of "the end of the earth" is because we have jumped out of the limitation of the earth, and Columbus's circumnavigation of the world has made us understand that "the end of the earth is at the end of the earth"!

Of course, the universe is so vast for us today, with an observable diameter of 93 billion light-years alone, that it is obviously unrealistic for us to perceive the size and boundaries of the universe through Columbus's circumnavigation of the world. <>

But human beings are advanced intelligent beings with other people and other animals, and although we cannot jump out of the universe, we can understand the universe with our own wisdom. Einstein's theory of general relativity tells us that the space-time we live in is elastic, it can stretch, stretch, and even tear like elastic cloth. This means that any linear motion that we usually see is actually doing a certain degree of curvilinear motion, moving along the curves of space-time.

The universe is full of all kinds of celestial bodies, nebulae and dust, and at the same time it is full of energy, Einstein also told us that mass is essentially a kind of energy, so mass and energy can deform space-time, which means that if you keep moving forward, go forever, you will never reach the so-called "cosmic boundary", just follow the space-time structure of the universe, and even have a certain chance to eventually return to where you started.

This is the definition of what is known as "the universe is finite but boundless". The most basic factor of our existence is because of space-time, as long as you are in the space-time structure, you have to move along the space-time structure, because you are a part of space-time, and without the space-time structure, you will cease to exist. To put it another way, as long as you can reach the place is the universe, so you can never reach the so-called "beyond the boundaries of the universe"!

So it's like "What's beyond the universe?" Does the universe have a boundary, and what is beyond it? Such a question is meaningless, and it can even be said that the question itself is wrong, and naturally there will be no answer, the universe is the collective name of everything, it has no boundaries.

But for many people, they will always have the question of "what is outside the universe" in their minds, and sometimes this kind of question comes up involuntarily, which is normal, because we have not seen with our own eyes how the structure of space-time is bent, and it is difficult for us to have an intuitive understanding based on abstract concepts alone!

As for the concept of "parallel universe", it still exists more in science fiction. Of course, the existence of the so-called "multi-dimensional" space cannot be completely ruled out, and like the "parallel universe", it is more of a science fiction color!

Beyond the boundaries of the universe should be a larger universe, and now everything is unknown, and it is possible that the universe has no boundaries at all.

Beyond the boundaries there may be other universes, other alien civilizations, or nothing.

Beyond the boundaries of the universe is the universe, because the universe is boundless, and the shape of the universe is unknown, infinite, infinite, and constantly expanding.

I don't know. As far as the current science and technology are concerned, we are not able to detect the matter outside the universe, and it is not very clear, the edge of the universe is **, and the future may know.