Is there a margin to the universe? Is there a limit to the universe?

Boundless, but with a detectable limit, the horizon, beyond which we are agnostic (the horizon is the universe at the moment).

There is a margin, the universe began with a big **, and now it is about a sphere with a diameter of 500-200 billion light years, and it is still expanding rapidly. How big it is, it is not yet possible to verify.

The person above doesn't understand what the event horizon is, which is the zero interface where light around a black hole cannot escape.

There is another person, of course there is a boundary to what is expanding, can you blow up a balloon and the balloon will be infinitely big? Do you still think that the universe is a piece of the "ether" in classical mechanics? There is no absolute space, since the birth of the universe, the edge of the universe is the size of the universe, and you can't get out.

Let me elaborate on the diameter of the universe.

First, to understand the universe as a sphere that is getting bigger, we can observe that the farthest is about 40 billion light-years.

First, we are not the center of the universe.

So then, I might as well assume now that with current observations, the diameter of the universe seen is 60 billion light-years (note, just hypothetical), 40 billion to the left and 20 billion to the right (here left and right are the long and short sides of the universe where we reach the edge of the universe). So when we see this thing 40 billion light-years away, it's actually 40 billion years ago, and in those 40 billion years, the universe has expanded a lot. On the other side, 20 billion light-years away is a different calculation.

Therefore, the accurate calculation should add the data of the expansion rate of the universe to get the diameter of the "now" universe.

In summary, the diameter of the universe is equal to (the diameter observed by humans + the size of the expansion of the universe over 200-40 billion years).

Yes! You imagine the universe as if a balloon is inflating! You're walking on the surface of the balloon, and it's inflating faster than you're inflating! If you have enough speed! I just walked around the universe and stepped on.

The universe is bounded but unbounded.

According to the theory of expansion and contraction of the universe, the universe is slowly expanding, and the universe is slowly shrinking. So the universe has no boundaries.

The universe has no boundaries.

According to the theory of quantum mechanics, the universe that has not been discovered does not exist, and is a "wave function" between existence and non-existence. When one observes there, the wave function collapses into the real universe. So the universe is as big as one can observe.

Human thought has no boundary, so the universe is also boundless.

The universe has boundaries, but because the universe is constantly expanding, its boundaries are indefinite.

The size of the universe that can be observed by humans today is about 91 billion light-years in diameter.

No, according to current theories, on three dimensions, the universe is likely to be finite and boundless, starting from a point, no matter which direction you go in a straight line, as long as enough time passes to return to the original point. It's like a two-dimensional sphere. As for whether the universe has boundaries in the fourth or fifth dimensions, or even higher, it is not yet known and there is no way to explain it.

The question of whether the universe has boundaries or not, like the question of the origin of the universe, is itself the limit of human intelligence. Although in three dimensions we can say that it is finite and boundless, in the higher dimensions there is bound to be the problem of boundaries. For example, although a two-dimensional sphere is finite and boundless, it is still bounded in three-dimensional space.

For example, the earth, from the surface of the earth, there is no boundary, but we are standing outside the earth, and the surface of the earth itself is the boundary.

If the universe has no boundaries, then there is a question, how did this infinite universe come into being? If there is a boundary, then there is a question, which is what is outside the universe?

Because the universe started from a point, it took a big ** to form today's universe. But in order to avoid the boundary problem, scientists have come up with the theory that the universe is finite and boundless.

The universe cannot be "infinite".

If the universe were "infinitely large", then the sky would be "infinitely bright" and the temperature would be "infinitely high".

This is not the case, so the universe is not "infinite".

Hubble: "The farthest galaxy ever seen, about 13.7 billion light-years away. Astronomers estimate that there may still be galaxies at 15 billion light-years. There are the boundaries of the universe known to mankind.

I think the universe is constantly expanding, so there is no boundary, maybe it will expand to a certain extent like a balloon**. This is just my personal conjecture.

No, the universe is finite and boundless, just like basketball, finite and boundless.

The universe is infinite, boundless, beginningless, and endless.

This can be counted as a philosophical proposition, according to modern physics, the universe is finite but unbounded.

There is no boundary, but not infinite.

According to the latest observations, the farthest galaxy that has been observed from us is 13.7 billion light-years. That is, if a beam of light is emitted from the galaxy at a speed of 300,000 kilometers per second, it will take 13.7 billion years to reach Earth. This distance of 13.7 billion light-years is the extent of the universe as we know it today.

To be clear, the extent of the universe as we know it today, or size, is a spherical space centered on the Earth with a radius of 13.7 billion light-years. Of course, the Earth is not really the center of the universe, and the universe is not necessarily a sphere, but we can only understand this extent due to our current observation capabilities.

Therefore, the universe has no boundaries, and our observation ability determines how far we can see, and our observation ability is developing, and the scope of observation is also increasing. However, according to the theory of the universe, the universe is still expanding.

The vast universe is boundless, and its depth is unimaginable, In April 1999, an astronomical research team at the State University of New York in the United States used"Hubble"The immense power of space telescopes. After more than 2 years of careful observation and scientific processing with electronic computers, more than 400 images of celestial objects overlapping in this direction were eliminated"Please"One of the oldest galaxies has emerged, and from the fact that it regresses and expands at the speed of light, it should be at the edge of the universe at 13.7 billion light-years!

The distance of 13.7 billion light-years is incomparable, and even the fastest light would have to travel 13.7 billion years to reach it. It can be seen that this farthest galaxy is also a celestial body shortly after the universe, and it is extremely precious and ancient"Cosmic fossils"Because in exploring the origin and evolution of the universe, the early history of the universe will be of immeasurable significance.

The universe is not infinite, or rather, the narrow universe we live in is not infinite. Its boundaries are still debated in what form they exist, but the idea that "our universe" is not infinite has been largely agreed.

Now there is an argument that space-time is distorted at the edge of the universe, meaning that you can get infinitely close to it, but you can't reach it.

As for the universe in a broad sense, that is, whether the universe outside "our universe" is infinite, this is not clear, just as it is impossible to talk to Xia Worm, the current human science and technology have no understanding of this, and the current research has not yet broken through the scope of our universe.

The universe is infinite, but it is bounded. Hawking's understanding of the universe is like a basketball, you can't find a beginning and an end on the surface, but it is bounded. It's like a lot of astronomy books are covered in it, if you look at Stephen.

Or it can be obtained from the big ** theory that our universe is still expanding, and galaxies are still regressing from each other, that is, the universe we know is still expanding, extending, and expanding, but it has not yet reached its end.

The edge of the universe is in my heart.

No one can say whether there is a margin of the universe or not, only speculation, at present, the maximum range of the universe we observe is about 20 billion light years.

Scientists use observational evidence and theories to suggest that the universe, although large, is boundary.

The current universe is still in the expansion of the world, and the speed is very fast, which has been proved by a lot of observational evidence, scientists call the power that supports the continuous expansion of the universe called dark energy, and some observational data show that the universe has expanded to the magnitude of more than 20 billion light years, that is to say, although our universe is very huge, but there is also a boundary, and this boundary is still extending, which shows that our universe is getting bigger and bigger.

Outside of our universe, there may be universes, and it can also be considered that there are many universes, and there are many theories about this, such as parallel universes, positive and negative universes, etc. But our universe is big enough to have so many things to discover, too many puzzles to uncover.