It s strange why some people say that the universe has boundaries?

The universe may just be an adjective, it has no concreteness, it is nothingness, the astral celestial body is the dust in this nothingness, the larger galaxies are a little more dust, and the small galaxies are a little less dusty, there is no point in exploring the boundaries of the universe, how can there be boundaries in nothingness, but human beings are driven by curiosity to explore, and when they really explore one day, they will find that this piece of nothingness is boundless, there is no end, and it is impossible to return home (maybe it can come back, but it is also countless earth years later, At that time, it has evolved into an alien in the mouth of compatriots on the earth), if you can't come back, you can only find a habitable planet to continue to reproduce, and then scientific and technological progress, continue this curiosity, we on the earth may be like this, the earth may be a foothold chosen by the ancestors from a distant home in the process of exploring nothingness, astronomers have been developing the aerospace industry has been exploring the universe? And then continue, generation after generation continue to explore, until finally the void is us everywhere, due to different evolutions, different levels of civilization, we have become aliens in our mouths, in all corners of the void those alien species may be our kind, we are all the same ancestor, but we don't know each other for a long time, maybe the DNA is the same, maybe they are all different, so "we" are still us?

Einstein's daughter asked one day, "Dad, why are you so famous?"

Albert Einstein pointed to a bagel and said: A beetle walks on it, and it doesn't know that the path it walks is crooked, and I know.

In fact, the universe has no boundaries. But its space is limited. It's as if the earth has no borders, but its area is finite.

Also, put aside the theory of relativity. Even if there are borders, it is not surprising. Some strange shapes have closed borders, but there is no distinction between inside and outside.

That's called a gram or a bottle, even if it's a model. To understand, you can search for "what to take, what to gram and what bottle" should be able to be searched.

Because people grow up in a society with borders, at least I think so, no borders are very slim for people! Borders, business circles, academic circles. There is a "boundary"!

It's not that the universe has no boundaries, but we don't see the end of it! At least that's what I think, there's another unknown world beyond the universe!

The current human intellect is not enough to comprehend the universe! Is there an end to the universe? What's outside the end?

Is there a beginning and an end? Where do we come from? Why do we exist and why do we die?

When does time start and when does time end? Can the human brain understand itself??? You'll never know how to think about it, which is beyond the limits of human imagination at the moment!

Therefore, even though we have carried out various explorations and researches and achieved certain gains, we are only in the stage of inference and imagination, and there are still many things in the universe that we cannot know! Unexplainable stuff!

Don't follow the crowd anymore, you will find that some of our conclusions are based on assumptions, that the universe gives birth to wisdom, and that wisdom can understand the universe. No one will give you the right answer at the moment, and you may never get it.

Can a cat understand why the earth has four seasons? Of course not, but it's too easy for us! The cat's brain capacity is not enough!

In the same way, there are things that human beings cannot understand, and human intelligence is limited and not omnipotent! Our intellect wants to truly understand the universe! I'm afraid it will come when we evolve into or emerge into more intelligent life!

But it takes time, maybe 100,000 years!

Albert Einstein said: The most incomprehensible thing in the universe is that the universe is intelligible!

There are boundaries. According to the current mainstream theory of the international scientific community, the universe originated from a large ** starting from a singularity at a time. And it's still in the process of swelling (this is supported by observations).

Since it is in the process of expansion, of course, it is bounded. The universe has been introduced by various theories to vary slightly in size, with estimates ranging from 128 to 18 billion light-years in radius. It is generally estimated that the radius of our universe is about 15 billion light-years.

But in short, it is limited.

As for everything outside the universe (including time, space, and everything), it is inexplicable. Or that there is no point in "studying" it. Because according to the theory of the great ** universe.

Even if there is something outside the universe, it will not have any effect on us. There will be no direct or indirect impact not only on us, but on anything in our field of vision. This can be proved on the basis of the spatiotemporal relations of the theory of relativity.

So we don't think there's even time there. Everything that we may have in our field of vision (called 'horizon') is confined to the universe. In other words, if there is an explanation for this question, it will always be (!)

It is impossible to prove. It is beyond our "horizon". So it doesn't make any sense.

Whether it's a vacuum or a lot of dirt or **, diamonds, it doesn't mean anything to us. Nor can it ever be known. Note that this is "forever".

Unlike some things that you don't know now, you may know in the future. This is something that can never be known. Unless the spatio-temporal relations of relativity are completely overturned.

Does our universe have boundaries?

Whenever people look up at the vast sky and wonder about it, there are always people who have to ask the question: How big is the universe? Is there an end?

Around the sun, there are nine planets of different sizes, such as Earth, Venus, Mars, and Jupiter, which are constantly orbiting, which is the solar system. So what kind of world is it outside the solar system? It was a galaxy with about 200 million sun-like stars.

The Milky Way is like a discus, with a diameter of 100,000 light-years and a central part of 15,000 light-years thick. If you fly out of the galaxy, where will it go? There, there are countless galactic worlds called nebulae.

Adjacent to the Milky Way is the Andromeda meteor group. This meteor group is about the same size and shape as the Milky Way, and is home to about 200 billion stars.

In 1929, Harvre in the United States discovered that all nebulae were leaving us. For example, the Hair Nebula, which is about 100 million light-years away, is traveling at 6,700 kilometers per second, the constellation Leo is traveling at 19,500 kilometers per second, and the Altair Nebula, which is 100 million light-years away, is moving away from us at an astonishing speed of 39,400 kilometers per second.

If this continues, the nebula will reach a speed of 300,000 kilometers per second at 10 billion light-years, which is equal to the speed of light. In this way, the light of all the stars will never shine on our earth. Therefore, a place of 10 billion light-years would be the end of the universe as far as we can see.

There are nebulae in the distance, but we can't observe them because the light can't reach them. Of course, this is a family statement, and there are other interpretations. Some people believe that the universe is balloon-shaped, that it is constantly expanding like a balloon, and some of these nebulae are approaching us.

Others have proposed that the universe is saddle-shaped, and like a saddle, it is constantly expanding towards the four edges of the saddle. According to this interpretation, in the distant future, the stars will gradually move away and the night sky will become monotonous and lonely. However, there are those who disagree with this, arguing that the universe is eternal.

Although it will expand indefinitely, new planets will be created in the expanded space, and no matter how the universe expands, new star families will be added. Therefore, the universe will not be desolate. Whether the end of the universe is at the end of the universe, human beings can only speculate at present.

Does our universe have boundaries?

Yes It's just vast.

The universe knows no boundaries ... The total mass of the universe can be considered definite, because you can destroy the universe but it is impossible to make one.

The quark disappears, and a billion new particles appear at most, so it is negligible.

But the universe has no boundaries, let's talk about the philosophical one, human beings define the universe as well.

Including matter, time, space, then we can know.

Everything is the universe, so where does the universe come from?

Scientifically speaking, the universe is like our earth, and the earth is distorted in two dimensions, and it looks like a sphere in three dimensions. But can you say that the earth has borders?

The way we see the universe now is still three-dimensional, no more.

When you reach the fourth dimension or higher,

The theory that the universe is finite and borderless is inherently impossible to change.

There is also the fact that the universe is expanding wirelessly

The universe is like a balloon that keeps being blown in. There will certainly be something bigger on the outside of the balloon.