Will the radius of the visible universe in the future be the same as it is now?

Viewpoint 1: According to the view of the universe, the universe begins at a point of mass with extremely high density and small body. ** After this occurrence, the universe expanded dramatically, and currently, studies have shown that many celestial bodies have a significant redshift phenomenon for our Earth (the displacement of the spectrum of a celestial body towards the long-wave (red) end. The wavelength of light or other electromagnetic radiation from celestial bodies may be stretched due to motion, gravitational effects, etc.

Because the wavelength of red light is longer than that of blue light, the effect of this stretching on the spectral characteristics of the optical bands is to shift them towards the red end of the spectrum, so these processes are called redshifts) and prove that they are moving away from us at different speeds, from which it can be inferred that the universe is constantly getting larger and increasing the spatial distance between the celestial bodies. The current radius of the universe is getting larger. In the same way, according to the gravitational field theory, when the universe runs out of energy to overcome gravity, the universe will collapse until it reaches a point where the radius will shrink!

Viewpoint 2: Now there is also a view that the universe exists in the first place, and the size of the universe is fixed, but because this statement cannot clearly explain the ** of the universe and what is outside the universe, it is not accepted by the mainstream. But it's not necessarily true! But if we follow this theory, the radius of the universe is, of course, constant!

I think you should know a lot about the universe before you ask this question, and it makes no sense to ask such a specific question without a sufficient knowledge base, in fact, we have not fully understood the origin of the universe, and the most authoritative theory at present is the grand ** theory of the universe, but it also has many flaws, your question is like asking us about the structure of the limbs of an animal, and we have not figured out the animal itself, and there are many arguments, you tell us how to accurately your question.

Generally inconsistent, the universe is still expanding, unless it is in the longer future, when the universe begins to contract, there is a phase that coincides with the present.

The above is a scientist's inference plus personal opinion)

So far, the radius of the universe that humans can observe is between 135 and 15 billion light-years.

One light-year is equivalent to about 10 trillion kilometers. The radius distance observed by humans may be the area of the total galaxy, and perhaps not beyond its range. The total galaxy can be thought of as the entire universe, and its existence and volume are not fully defined, because the universe is constantly expanding, and perhaps next year the radius of the total galaxy will expand to 17 billion light years.

Humanity hasn't explored beyond the solar system yet, and is talking about the universe? It's just a fantasy, but wormholes in the universe might be able to travel through time and space, maybe to the other side of the universe, and it's just a matter of imagining that human technology hasn't reached that level yet.

The observable universe refers to the range of light energy from the outside universe to reach the earth, and every year will increase the light emitted by objects outside the year to reach the earth, and the definition of light year is the distance that light travels in a year.

That is to observe that the farthest star from the Earth has expanded so much, and there will not be so many closer to the Earth, scientists say that there is even a galaxy that will continue to get closer to the Earth, and some will play a "zero distance" with the Milky Way in the future, merging the two into one.

The solar system, the Milky Way, including the outer galaxies, are expanding all the time, and the universe is expanding.

Because the space of the universe is expanding, the space is stretched. What was supposed to be an expansion of one light year became half a light year!

Because the diameter of the universe expands by 1 light year in a year.

At present, the radius of the visible universe explored by mankind is 13.7 billion light-years.

The farthest celestial body that humans can now see is 13.7 billion light-years away from Earth, and we believe that the universe was born 13.7 billion years ago. But because the universe expands faster than the speed of light, the scale of the universe is inferred to be more than 13.7 billion light-years.

This is because the universe is expanding.

The expansion of the universe causes the farther away the celestial body is, the faster it moves away from the Earth. According to the Doppler effect, radiation emitted by distant objects produces a redshift that is proportional to the speed of the distance. Since all celestial bodies are moving away from each other on a large scale, redshifts occur.

Moreover, the degree of this redshift is only related to the distance, not to the state of motion of the observer itself.

For example, if you run in the same direction with two other people, all three of them have different speeds. One of them is faster than you, and the other is slower than you. After running for a while, there is a person in front of you and a person behind you, and you are in the middle.

Since the person in front of you is running faster than you, he will get farther and farther away from you. The people behind you will run slower than you and will get farther and farther away from you. So if you are used as a frame of reference, both of you are moving away from you.

The same is true for our planet. When we observe the universe on the earth, we use the earth as a reference system, and we can ignore the motion of the earth itself. So for the Earth, no matter which direction you look, the distant galaxies are moving away from us, and the farther away from us, the faster you move away, as if we are right at the center of the universe.

In fact, no matter where you observe the universe in the universe, the observed phenomena are the same, and the galaxies in the distance are moving away from the observation point. In other words, any point in the universe is the center of the universe.

The radius of our universe was at least 10 billion light-years ago, and what humans can see with telescopes is about 10 billion light-years.