What is outside the universe? Is it true that the universe is observable for 93 billion light years?

We often mention the human so far observable universe range of about 93 billion light-years in diameter, then mentioned 93 billion light-years this distance range is easy to let us will have a question.

What does the universe beyond 93 billion light years look like?

Is the world outside the universe the same as what we see now?

To understand what is outside the universe, we must first understand what the universe is.

Einstein once understood the universe in this way, he believed that the universe is the whole of time and space.

He was also the first scientist to discuss time and space together, and before him, people thought that time and space were separate.

According to Einstein's theory, we can think that time has no end.

And time and space are a whole, which means that we cannot find the boundary of space-time structure in any way.

Also, we can dissect the structure of the universe from another perspective.

So far, one of the most popularly accepted ways of the birth of the universe is the Big Bang theory.

According to the Big Bang theory, we can speculate that the universe we live in is not flat, but has curved and twisted everywhere.

If there is a huge space-time distortion in the universe, then it also means that even if we humans can keep going forever in a certain direction, it is impossible to go to the end and out of the boundary.

Why? Let's take the Earth as an example.

Humans on Earth can walk in any direction in a straight line, but because the Earth is a circular sphere, humans walking in a straight line on the surface of the Earth can never get out of the Earth.

The same holds for the universe.

At the same time, if we want to discuss what the world outside the universe is like, we have to discuss the boundary of the universe.

Does the universe have a boundary? Or is it a finite and boundless model like the Earth?

According to our current science and technology and our knowledge of the universe, it seems that there is no point in discussing the boundary of the universe, and it is even a pseudo-proposition.

As far as the universe we have observed so far, there is an isotropic principle in the universe.

What is isotropic?

Simply put, I wonder if you have ever noticed the phenomenon that no matter which direction we look at the universe from, it seems that the universe is the same.

Let's take the 93 billion light years mentioned in this issue as an example.

Why would scientists give such a figure?

The origin of 93 billion light years is a sphere with the Earth as the center and a diameter of 93 billion light years.

The implication is that such a conclusion is to see this universe with the Earth as the center.

If we put the isotropic principle of the universe into 93 billion light years, then we humans can also take Mars as the center to observe the universe.

We can also take the Sun or even the center of the Milky Way as the center of the universe to look at the universe, and we will get the same result of 93 billion light years in diameter.

So the sphere of the observable universe with a diameter of 93 billion light-years that we are talking about today is a limitation of human technology.

In the real sense we have not found the center of the universe, nor have we discovered the boundaries of the universe.

Of course, the Big Bang perhaps is not the truth. It is just a speculation of scientists.

Perhaps shortly, the Big Bang theory will be replaced by other newly born theories, such as the multiverse theory that we mentioned before.

The multiverse theory suggests that there could be an infinite number of universes, that the universe we live in is one of them, and that there are many other universes similar to ours outside of it.

Perhaps this is just a hypothetical theory of scientists.

Maybe we can never get an answer to the question of whether the universe has a boundary and whether it has a center. But this will not prevent human exploration of the universe.