What is the boundary of the universe?

Reprinted from Baijiahao Author: Science and Technology Marathon

Hello everyone! Today, let's talk about what is the boundary of the universe. Since we began to study the night sky, we began to describe everything around us with a simple concept. Everything on earth and beyond, all planets, all stars, all galaxies, this concept is our universe.

The universe is unique and beautiful. This is what we see and what we know. The sum of everything. For a long time, we were satisfied with this concept because it was very reasonable, but in recent years, some scientists who don't take the usual path are looking for defects on this consistent path.

In fact, when they were studying, they completely abandoned the existing concepts. For cosmologists, the farthest part of the universe is located in the area where light energy reaches us from time. This area is called Hubble volume, which is perfectly presented in machine-generated pictures.

It is affectionately called our universe by us. This spherical space region is the region where light energy reached us during the 654.38+03.8 billion years since the Big Bang. You may ask, is this all? Or is this all we can see? The development of cosmology has gone through a long way.

Now the scientific community has strong evidence that the real universe, a complete universe, is much bigger than this. You may ask this question: What is beyond the boundary of our universe? What was before BIGBANG? Although we think this is all that we can observe, some scientists don't think this is all that exists.

This may be just a small part of a much bigger thing. Our universe extends 65.438+0.38 billion light years in space, which is a wonderful thing, but it is not the only one. So as the only universe, I'm afraid you should retire. Your existence is great! Brought us a wonderful experience! But it's time to quit the stage!

Retireing the universe sounds like a cold joke, but for these scientists, a single cosmology is meaningless. For different reasons, they think our universe is just one of the infinite universes! This idea was once considered incredible by people, and even if it was mentioned, others would think you were crazy.

But now the scientific community has dared to believe that it is actually true. They also believe that our universe is not unique, and our universe is just one of the infinite magical worlds. Is one of the vast multiverses! What is the boundary of the universe? With the current level of human scientific and mathematical cognition, the universe is infinite!

And produced an infinite multiverse! Our universe is one of the infinite universes, and the diameter of each universe is about 90 billion light years! And each universe contains a limited number of particles, as long as there are enough particles arranged in the universe. Will get exactly the same universe! Equivalent earth! And equivalent to you!