The universe is infinitely extended, so what is the part that has not yet been extended?

Human doubts about the universe often stem from the ambiguity of the concept of the word "universe". The real scope of people's definition of the word "universe" is the sum of the objective world, but in fact, people's knowledge and understanding of the "universe" is actually the sum of sensory knowledge. What is beyond the universe?

If the "universe" at this time represents the sum of the worlds, then there will be no "universe" outside of it; If the "universe" at this time indicates the scope of human sensory cognition, then beyond the "universe" is unknown to man, and it is meaningless for the unknown to ask "what is".

I think it's something like the current intergalactic space (the space that exists between galaxies), that is, it is filled with extremely thin plasma, with an average density of less than one atom per cubic meter.

It's a white hole, it's just a concept, human beings have been exploring the source since they were conscious, and all is equal to nothing.

The universe is four-dimensional, and what you think about is based on general three-dimensional thinking, and one-dimensional is the timeline. And there is a contradiction in your question itself, since it is an infinite extension, how can there be a place that has not been extended? So I'm not sure what you're trying to ask either.

If anything, it should be a vacuum.

The boundaries of time and space, if you can walk there, you will cross it.

There is more than one universe, and now many scientists have discovered this problem.

Because there is a distance between light and the universe, the universe will be bound by light, so there will be different radiation situations, and the light will be pulled up with the universe.

Because the universe is very large, the binding force between the stars will slowly decrease, so the universe will expand.

There is a high probability that there is nothing beyond the universe. The vast universe has been the object of continuous exploration and pursuit by human civilization for thousands of years. The universe is vast and boundless, from our thousands of years ago, all kinds of reveries and assumptions about the universe; Nowadays, human beings continue to expand and break through the universe through modern science, which is almost one of the themes of human reproduction to this day.

In today's scientific theories, the birth of the universe originated from a great ** 13.8 billion years ago, which can also be said to be a "great expansion". After the rapid expansion of the singularity, the major "parts" were sprayed to every corner of space, and only then did we have the universe we know today.

This kind of "expansion" has been discovered and confirmed by major scientists since the concept was proposed by the famous physicist Hubble in the last century. At the beginning of the century, NASA received a signal from the celestial bodies to "expand", which means that the "expansion" of the universe has not stopped. And the speed at which they expand, after the model is built, is also very amazing.

At the moment, it's about twice the speed of light. Since the universe is expanding at such a rapid rate, it means that it is not "infinite". What lies beyond the universe?

Things outside the universe may be beyond our comprehension. The famous philosopher Wittgenstein once said that "the boundary of language is the boundary of thought", and if we break through the category of our language, then things will become "unknowable". Therefore, it is very likely that we will not be able to recognize things outside the universe.

According to Einstein's description of the universe, the universe today is "finite and unbounded". What is "unbounded"? That is, the universe is a sphere, and we live on the surface of the sphere. So we will never be able to break through this "ball" and recognize the outside world.

Of course, there may also be a complete vacuum outside the universe: then it may also be a very "boring" thing for human beings.

There should be nothing outside the universe, because people's cognition is the whole universe, and there is not enough knowledge outside the universe.

This problem cannot be explained by current human science and technology, and it is very likely that there is a parallel universe or a multiverse outside the universe. And that's just our guesses.

In fact, we do not fully understand the world outside the universe, and the mysteries in the universe are actually endless, and we need to continue to explore, and this also leads us to explore the world.

There is a wider world outside the universe, and there will be other stars, the vast and infinite universe is all-encompassing, and it is very likely that there will be aliens outside the universe.

The main reason why light will be stretched with the expansion of the universe is actually due to the relationship of gravity, which can distort space, and the propagation of light needs to follow space, so the space becomes longer and the light will naturally be stretched.

Because the propagation process of light is accompanied by the change of energy, and the expansion of the universe will cause the loss of energy in the propagation process of light, the speed of light slows down, so the phenomenon of stretching occurs.

The light learned in a middle school textbook travels in a straight line, but in fact it is not, and light also travels in a curve. And as the universe expands, the imaging of light is stretched.

Because the speed of the universe has long exceeded the speed of light, it is said that at a great distance, light will never reach the earth, and the earth will never know what the farthest place will be like, so the light is elongated.

When it comes to what is extracosmic, we have to talk about the universe at the beginning, before the universe is big, there is no meaning, there is no concept of time, and there is no concept of space, so the extracosmic can be summarized as nothing. (This is a rather clichéd view, which says little about anything, except that there is no matter outside the universe that exists as we know it) 2The universe is a near-sphere, the first point of the universe is not flat, the general theory of relativity has mentioned, the second point is that there is antimatter in the universe, so that Einstein's cosmological constant is resurrected, originally he himself thought it was wrong, antimatter is accelerating the expansion rate of the universe, but after the expansion of the universe, the density of antimatter in the universe gradually decreases, this acceleration value will decrease, the universe will gradually do the acceleration a value of decreasing motion, and finally the a value will become negative, The universe will gradually stop increasing and then accelerate and shrink (there is a view that the universe is constantly going back and forth and contracting, realizing one universe after another, similar to a spring).

3.In the view of parallel universes, many scientists say that parallel universes are finite, because the way quarks form matter is finite, (my opinion, but the laws of physics do not necessarily apply to other parallel space-time!). The current scientific level of human beings is not yet able to ** parallel time and space, because the parallel universe says that our universe is just a bubble universe, a thin layer of bread, and our universe may be produced after the collision of two parallel universes, but there is no way to confirm.

4.Black hole, although the black hole is the result of the collapse of a red giant, is a celestial body, but there is no evidence that it is not connected to the wormhole, if there is a wormhole, the universe may be connected by the wormhole n universes, but it cannot be proven, so it is still empty talk, but the universe is so big, how big is the thing that holds it outside? This has something to do with the wormhole, because the mass of the black hole is very large, the big one can make the light unable to escape, it is speculated that if a spaceship enters the wormhole, the spacecraft will be compressed to be smaller than an atom, but the people inside do not feel the feeling of being compressed at all, for our universe, it may be the case, the so-called boundless universe may be compressed in a very small nucleus, or inside the atom, just like in the movie "Chrono Contact", In fact, the universe is only in the eyes of a little girl, and there is no end to it.

It is difficult for human beings to detect the outside of the universe, at least so far, because the current universe is accelerating and expanding, the speed is greater than the speed of light, and the speed of light is a speed that we humans cannot reach, and we are insiders, the so-called bystander Qing, Einstein said that people in a uniform motion or stationary elevator do not know whether they are moving or stationary, maybe our universe is in high-speed uniform motion, and it is impossible to know. The above is what I have combined with what I know, and I have come up with the point of view, what is outside the universe, no one on this earth can help you answer for the time being, and it may not be possible in the future, the only thing to do is to speculate in combination with the physical laws I know.

The universe that we humans observe is finite, but the collection of all material space is infinite, and this collection of all space and time is called the universe. Since the propagation of the force is discontinuous, so the cosmic force is perturbated and broken, Yang Zhenning and Li Zhendao found that the universe is not conserved, which also indicates that the universe is broken, and naturally we observe that the universe is expanding. The expansion of the universe does not develop at the speed of light, the expansion takes place at 50 kilometers per million seconds (the Hubble constant has a specific calculation process here, and the greater the distance, the greater our expansion effect, and the redshift of celestial bodies is proportional to the distance, which can be calculated from the redshift of celestial bodies.

All celestial bodies are suspended in different positions in the universe, and the magnetic field spin is layered and balanced in the universe, and the universe is not terrible from a physical point of view.

You can imagine that the universe is a balloon full of dots, and the dots represent the stars, and when you blow up the balloon, the balloon keeps inflating, but can you see the boundaries of the balloon? If you're so interested, I suggest you read "A Brief History of Time" written by Stephen Hawking, and the above arguments are very convincing...

To correct the questioner's mistake, the expansion of the universe is not at the speed of light, suppose that if the Earth is the origin, then the speed at which other stars move away from us is related to their distance from the Earth and their mass. We don't know anything about the extra-universe world, and all our theories so far don't hold up in other universes (if they existed), but some speculate that parallel universes exist, and that general relativity allows for new space-time to exist.

First of all, the universe is inferred from the redshift phenomenon and the Doppler effect, and as for what is outside the universe, I honestly don't know, and no one dares to make a conclusion now, science must be rigorous. I only know that due to the big **, the universe is expanding, and the temperature of the universe is cooling, and finally it will retract into the most primitive singularity.

Maybe it's another universe.

The universe already includes anything in our minds.

First of all, this is a DU problem of the BAI spatial concept. We exist in the three-dimensional space and live in the four-dimensional space version.

However, it is difficult to understand the space of the five dimensions, and the spatial existence of the universe is up to 12 dimensions, and the fact that our eyes cannot see does not mean that things do not exist. The existence of space cannot be understood if we only use our three-dimensional concept of length, width and height. The universe does not exist in such a way as rooms next to each other.

Different spaces can overlap at the same location. If the landlord wants to understand the truth, it is unimaginable because we live in a low-level space, so we can't understand the existence of a high-level space. Newton's classical physics, which we are learning now, is actually wrong, Newton believed that time is uniform, but why is time uniform?

He couldn't prove it, in fact, he also assumed, in fact, Einstein finally proved that time is a variable speed, and that time is only an illusion, just an illusion caused by light entering the eyeball. There is no past, present and future at all. Einstein proposed that there is a plane in space, which can be distorted, and distortion can cause spatial teleportation, that is, wormholes.

That is to say, the landlord is now at home, and he can really travel to the United States and even alien planets in an instant.

If the landlord finds it difficult to understand, he can first understand the concept of space, and then look at the theory of relativity. Hope it can help the landlord.

The universe is the collection of everything in this space where we are!

The expansion of the universe means that the average distance between matter in this space is increasing!

The diameter of the universe is about 300 to 40 billion light-years, not the length of the space we are in.