Is there an end to the expansion of the universe? Or is there time outside the universe?

According to the existing cosmological theories (not necessarily correct, perhaps we will have more advanced theories in the future), whether the expansion of the universe has an end depends on dark energy, which is the main factor driving the accelerated expansion of the universe. If the dark energy does not decay, then the universe will continue to expand at an accelerated rate, and eventually gravity will no longer act, and the universe will fall into infinite expansion. If the dark energy decays, then gravity takes over, pulling the universe back to where it began.

Time is dependent on the universe, and the universe here is counting on the universe in which we live. The place where time begins is the source of the universe, and if the universe stops, then time will also disappear. If the universe is infinite, time will go on indefinitely.

Personally, I think the most incredible thing in the world is time. You don't feel it, but the sun still rises and sets day by day. Some things stay like that over time, and some things are the same day after day.

Maybe if we can explain time, we can also explain the universe.

1) Alexander. Starting from Einstein's theory of relativity, Friedman studied the structure of the "dome". He discovered that a space where time does not change, that is, a universe at rest, does not exist.

Over time, the space either gets bigger or shrinks. Friedman makes a distinction between the two situations. Obviously, the universe is expanding, galaxies are moving away at a certain speed, and the force that prevents this process comes from the gravitational pull between galaxies.

In the first case, when the density of the entire universe is high, the gravitational pull is also very large, so the speed of the galaxy's retreat will continue to slow down until the galaxy's retreat stops, that is, the expansion of the universe stops. This process of stopping does not last long, the force that slows down the universe causes the universe to reverse its course, and as if a film was played in reverse, the universe begins to contract until it becomes a point. This model of the universe is called a closed model; The open model starts with zero volume, and once it starts expanding, it keeps expanding, because the density of matter in the universe is not enough to provide the gravitational pull that stops it.

These two models are like the scenario of a human launching a rocket. When the rocket runs out of fuel and the velocity is less than the first cosmic velocity, the rocket lifts off more and more slowly, and finally falls back to the ground under the attraction of gravity. If the rocket reaches its first cosmic velocity after running out of fuel, it flies into space, saying goodbye to the ground forever. The phenomenon we are currently observing in the universe is that galaxies fly away from each other.

Whether it's a closed universe model or an open universe model, galaxies are bound to slow down over time. However, humans living in an expanding universe cannot tell whether the model of the universe is closed or open, because both have periods of expansion. Let's let go of the wings of imagination and imagine that the "human beings" living in the shrinking universe will also be troubled by choosing a model of the universe, whether the universe will shrink forever, or will it expand again after contraction?

Every house has a scripture that is difficult to read.

Friedman also established a third model, called the Straight Style, in which the universe expands as much as a closed, open one at the beginning, and then hovers on the verge of contraction, although the universe also expands continuously.

But the winner of the 2011 Nobel Prize in Physics found that the universe is expanding at an accelerated rate, that is, contrary to Friedman's theory.

So what the latest theory has found is that there is no end to the expansion of the universe!

2) Time only takes effect within the scope of the universe we know, and it is pointless to talk about time before or outside the universe!

The universe is a collection of time and space. There would be no space without time, and in the same way that space does not exist and there will be no time. Outside the universe, if everything is at rest, there is no time.

The statement that the universe is expanding is false. The universe in four-dimensional space-time coordinates is a spherical shell-like entity. Our universe is one of many. But it's not a parallel world. The part of time that does not coincide with space is called imaginary time.

The expansion of the universe is not clear. But there are often parallel universes outside the universe, that is, many other universes that are different from us, which explains why some constants in our physics seem to be irregular, because they are random and different in different universes, which is explained in the term multidimensional space.

There is no definition of extracosmic space, it is something unknown, and even the concepts of space and time may not be suitable for that thing. Current calculations suggest that the universe will collapse under its own gravity.

Everything has a beginning and an end, and it is impossible to continue forever. This is a question that scientists have not proven.

The universe in which humans on Earth live is not unique, but is made up of two vast twin universes. The difference between the two universes lies in the difference in their respective atomic loads, which in layman's terms are the so-called world of matter and antimatter.

1. In the positive universe, the outer shell of an atom is composed of positrons, and these positrons are fixed in the orbit of the nucleus by antiprotons. anti-cosmic and just the opposite;

2. The two twin universes can never be touched. The claim that they can be contacted is meaningless, because there is no connection between the two (e.g., it cannot be said how many light years they are from each other, nor can it be said that they have the same concept of time, in short, there is no possibility of comparison between space and time);

3. The two universes have the same weight and the same radius;

4. The two twin universes have their own characteristics [there are not so many galaxies in the anti-universe, and the structure of each galaxy is also different], therefore, there are no alien twin stars, and there are no twin planets of the earth;

5. Two twin universes were born at the same time, but their respective concepts and scales of time are different, and the direction of time extension is not parallel. Therefore, it cannot be said that your universe exists in the same time and space as our universe, and that there is no distinction between you and me or me before you in terms of time. We can go forward in time or backward in time, and your time here is one-way, only forward.

6. In our universe, galaxies move like floating islands in the vast ocean of the universe. However, this sea is multidimensional, galaxies are full of gas, and the relationship between the universe is very different from that of the universe, because they exist in nothingness, so it is impossible to imagine the distance between them;

7. Although the two universes are not connected in time and space, the anti-universe still affects our universe. It is by analyzing this influence that we can deduce the existence of an anti-universe.

8. At the same time, our cosmology is also developing, there are many pairs of twin universes, countless pairs of twin universes are subject to their own unique speed of light, and the specific speed of light of each pair of twin universes is itself variable and controllable, that is, by virtue of this variable and controllable characteristics and corresponding technologies, we can freely travel between our own pair of twin universes in the future, and can freely travel to other twin universes. Civilizations with different levels of development exist in different universes, and human beings on earth are not loners in the universe, nor are they the end of life forms.

We have been talking about the origin of the universe for more than 100 years, and at first many people thought that the universe was eternal. The reason for this is very simple. In ancient times, there was no light pollution.

When one looks up at the sky, one can observe that celestial bodies such as the Moon, Sun, Venus, Jupiter, Saturn, Mars, and Mercury are almost motionless. Thus, the concept of the five elements actually comes from these five planets, while the sun and moon are given special treatment. There is no content for the development of an ancient astronomical calendar here.

In fact, the ancients just wanted to express that when they looked at the sky, the universe seemed to be constant over a large scale, so they thought that the universe was eternal. "Eternity"What we really mean is that the universe has no beginning and no end. This is true of both the circular heaven and earth in ancient China and the geocentric theory in the West.

This thought persisted for a long time, and Newton as we know it also held this idea. He had no choice but to do so. As we all know, he came up with the famous law of gravitation, which states that everything is attracted to each other and to each other, so matter will converge towards the center, which means that the universe will eventually converge to a point.

In fact, this is not what we see in the universe. Therefore, Newton believed that the universe should be infinite, and that gravity everywhere should be in dynamic equilibrium, so that the universe could converge towards the center. Newton's ideas influenced many people, and some questioned him, but they have always been dominant.

It wasn't until more than 100 years ago that the famous physicist Albert Einstein was born. Gravitational field equations in general relativity. In fact, Einstein also believed that the universe is eternal, and there is a name for this:

A finite and infinite static model of the universe. To put it bluntly, even Einstein believed that on a large scale, the universe does not change over time.

In 1915, Albert Einstein formally proposed his theory of general relativity. In the general theory of relativity, Einstein proposed an equation of gravitational field from the general theory of relativity. This equation is actually used to describe the universe.

How did the universe come to be? It's just that Einstein discovered that this equation predicts that the universe should expand over time. This contradicts his model of a static universe of finite infinity.

Therefore, he added a cosmological constant to the equation that, if taken in the right way, would counteract the expansion effect and make the universe static.

There is no beginning and no end, the scale of the universe is relatively large, and the time when the universe was formed was 13.7 billion years ago, because there was a big ** at that time, and all the matter and energy were gathered together.

The universe definitely has a beginning and an end. According to the analysis of scientists, the universe is created in a big way, but we don't know what caused it.

The universe should have no beginning or end, because we don't know much about the universe, and the universe may have come into being through stars or planets.

No. Because the starting point is irreversible, and the universe is now constantly expanding, it will not return to the singularity state.

The universe is divided into two domains, the inner domain and the outer domain, the inner domain is the vacuum domain, there is a bright matter, and there is an extremely small amount of residual dark matter, which is the formation of the singularity; The outer domain is a non-vacuum domain, with extremely dense dark matter, and there is a special cohesive force in dark matter, which is greater than the reaction force of deuterium and tritium. The last black hole in the inner domain disappears and darkens the light matter, the expansion of the inner domain stops, the outer domain begins to contract, and the inner domain disappears back to the singularity; When the critical minimum domain of the singularity is reached, the singularity is again **. Generate new inner domains (visible universes).

Yes, because the development of all things is a cycle, and the universe will return to the starting state after a long period of development, but this is too long for a small human being.

Quite possibly, because now the universe is transitioning towards the state of the singularity.

When the universe will end, this is still very far away. Because the universe has been in existence for more than 100 years, and then when it really comes to extinction, it will be at least 10 billion years laterIt is still quite distant for humans, because none of the life on Earth is that long. <>

We don't know when the universe will end, but we can figure out when the solar system will disappear and whether the universe will end, which is too far away. Because the universe is so big, so big that we don't know about it at all, the core of the solar system is the sun, we can use the activity of the sun itself to ** the time of the existence of the solar system, according to the inference of scientists, the effective time for the sun to continue to shine and heat will be about 5 billion years,That is to say, the sun will have a big ** in this long time, and then the energy will gradually disappear, and the solar system will disappear. <>

But 5 billion years is still far away for human beings, because the life of our earth is only about 4.6 billion years, and it has not yet exceeded this year. The sun appeared as early as 5 billion years ago, and it is not a problem to continue to exist for another 5 billion years according to the current luminous intensity of the sun, and the time when human beings appeared from the earth is 5 million to 7 million years, from the beginning of human ancestors, we have only lived on the earth for so long. In another 50 million years, the question of whether human beings will exist is a question, and the chances of another 500 million years are already very small, let alone another 5 billion years.

If human beings still existed at that time, then it is believed that the technological level of human beings themselves has developed to the extent that they are completely capable of crossing the solar system to reach other emotions, and even to cross the Milky Way galaxy to reach other large planets. Because the development of modern science and technology of mankind has only been a few hundred years, it has already had the ability to go to heaven and earth, so after tens of millions of years of development, I believe that mankind will definitely have this breakthrough.