It is said that the universe is expanding, so where is the center of its expansion?

Since the expansion of the balloon actually starts from the inner center of the three-dimensional space, and we are in the two-dimensional space, we cannot clearly detect things in the three-dimensional space, and in the same way, the interior of the three-dimensional space is not the starting point of the expansion of the universe, but we can only move in the three-dimensional space of the universe. Sometime in the past, when the universe began to expand, perhaps hundreds of millions of years ago, although we can see that we can get relevant information from it, it is impossible to go back to that time.

The universe is not expanding into space, but into space itself. Because expansion occurs anywhere in space, it doesn't make sense to talk about the center of the universe in space. Of course, the universe is not the surface of a giant balloon, but the analogy is still valid.

In fact, astronomers have discovered through actual observations that almost all galaxies are far away from us, so no matter what you are observing, you are the center of the expanding universe. So the universe has no center.

However, this view does not explain all phenomena, and whether the universe has a center or not remains to be proven, and we can all imagine that if two dots are drawn on the surface of a balloon, and then as the balloon expands, the two dots will move away from each other. These two points themselves have not moved. What has changed is that the space between the two points is getting bigger and bigger.

In fact, this is true for every single point. So no matter what it's in, every point is the center of expansion, it's just an observable universe, and the rest of it, the simple answer seems to be that no one knows, but in fact we know the answer, because the universe has some strange properties. As we all know, the universe is expanding.

This means that the distance between objects becomes larger and larger over time.

As for the question of where the center of expansion is when it is said that the universe is expanding, I will explain it here today.

The universe is in a period of expansion, and its center of expansion is at the junction of the Milky Way and the solar system, that is, the common place of the two galaxies, and this place is the center of expansion of the universe.

The center of the expansion of the universe is in the three-dimensional center of the universe. Because the world we live in is a two-dimensional world, we can't really find the center.

The so-called expansion of the universe refers to the expansion of the entire universe, without a center, or the center is the entire universe. The big ** theory says that the universe originally expanded from a point, and today this point has expanded very large, and everything including time and space galaxies is within the point.

Since the expansion of the balloon actually starts from the inner center of the three-dimensional space, and we are in two-dimensional space, we cannot clearly detect things in the three-dimensional space. In the same way, the interior of three-dimensional space is not the starting point of the expansion of the universe, and we can only move in the three-dimensional space of the universe. Sometime in the past, perhaps hundreds of millions of years ago, when the universe began to expand, it was impossible to go back to that time, even if we saw that we could get relevant information from it.

Because the universe is expanding all the time, according to our definition of the universe, anything that really exists can be summed up as the existence of the universe! In other words, there may be other universes outside of it. Our universe is simply expanding outward, compressing the space of other universes.

Similarly, other universes expand or become larger or smaller.

In order to observe the origin of the universe, we need to start with the big **. A wide-phase cosmology has emerged in the scientific community. Because many scientists have already deduced from the general theory of relativity that the universe is a dynamic process, Lemet further proposed the primary atomic hypothesis.

In fact, this is the predecessor of the grand theory of the universe. Hubble had just observed that the universe was moving farther away at a faster rate, so the expansion of the universe came from there. By looking at distant galaxies in the depths of the universe, scientists have found that the speed at which they leave us accelerates with distance.

The universe is expanding, indicating that it has an initial singularity, which is an important basis for the general understanding of the scientific community.

These universes are also parallel, with competition and mergers. This multiverse view has also been endorsed by some scientists, as it also explains why our universe is expanding and unlimited. The universe is a cyclical process.

A universe, like one's life, has a beginning, prosperity, decline, and demise. However, after the death of one universe, another universe will be born! In other words, the universe is never-ending.

The temperature of the nascent universe is extremely high. At this point, the photons were still bound in it until 380,000 years later. As the universe expands, the temperature decreases step by step, and photons are released.

The released photons diffuse through the universe and begin to form matter with other elementary elements. After the formation of matter, there are no stars in the universe at this time, and it is a time of complete darkness. The universe continues to expand, and matter gradually forms stars under the influence of gravity.

There are very large places outside the universe, because the universe is vast and endless, and at the same time, it is constantly expanding outward, and there are many galaxies and stars, forming a very powerful cosmic carrier.

There will be trillions of light-years. The universe is very vast, and now human technology is very limited, and only 93 billion light-years can be observed.

There is a very big place outside the universe, because the universe has infinite mysteries.

The universe is indeed expanding, and the current primordial gravitational wave signals are all showing that it is expanding. As we all know, in the 21st century, mankind has made sufficient progress in many fields of natural science. After the blowout of scientists, physicists, mathematicians, so to speak, in the last century;

On the road of science, with the blessing of new theories such as the theory of relativity and quantum mechanics, we have become more comprehensive in understanding the universe and transforming the world. The theory of the origin of the universe has also undergone several renewals.

At present, the theory of the origin of the universe that dominates the academic world is the so-called "big ** theory". Where is the big ** theory sacred? It argues that the origin of the universe comes from a Schwarzschild singularity with an internal temperature and infinite expansion of mass; The Schwarzschild singularity expands rapidly under the intervention of external forces;

Let the internal superforce be divided into four, forming the four basic forces of nature; Subsequently, the realm of space-time was infinitely expanded, and as a result, our observable universe came into being. This theory can also lead to the conclusion that our universe is "still expanding".

That's right, the big ** theory, which holds that the universe is still expanding to this day. Moreover, the data shows that this expansion is already faster than the speed of light, and even more than several times the speed of light. But is there any evidence for this statement?

After all, the core of the scientific spirit is "empirical evidence".

Of course, there are. Even, to put it bluntly, the reason why the big ** theory has become the current hegemon-level origin theory is because the signal of "cosmic expansion" has been discovered by us. At the end of the last century, the famous astronomer Hubble and several NASA researchers discovered primordial gravitational wave signals hundreds of thousands of light-years away;

This phenomenon not only confirms Einstein's prediction decades ago, but also shows that the universe is still expanding rapidly. Therefore, the big ** theory is indeed the theory of the origin of the universe that is closest to the truth at present.

The expansion of the universe, and the expansion at an accelerated rate, is a discovery made by astronomical observations over the past 100 years, and is supported by more and more evidence.

The earliest evidence is the redshift of galaxies, and Hubble's earth-shattering discovery completely overturned the static cosmology that the scientific community has insisted on for hundreds of years, thus laying the most solid foundation for the standard model of the universe.

Copernicus proposed heliocentrism, breaking the religious spell on the movement of the celestial bodies; Galileo built a telescope to observe celestial bodies and measured the speed of light with a horse lantern, giving birth to the germ of modern science.

Therefore, the history of science generally regards Galileo as the progenitor of modern science.

However, Galileo's time had limited observation conditions and determined that the universe was static.

The static cosmology holds that the universe is boundless, has no beginning and no end, has always been like this, and will never change.

What has changed is only the partial sun, moon, stars, and stars, and the entire universe is unchanged.

This understanding is deeply ingrained in the ruling scientific community, which has been ruling for hundreds of years.

From Newton to Cavendish to Einstein, no one questioned it.

According to its general relativity gravitational field equations, a solution to a dynamic universe that is constantly changing is derived.

In order to cater to the mainstream theory of the static universe, he had to add a "cosmological constant" to his equation to make the equation self-justifying.

The equation is from r v-(1 2)rg v=kt v to g v+r v-(1 2)rg v=kt v, where " " is the cosmological constant.

When Einstein learned of Hubble's discovery of the redshift of galaxies, he immediately rushed to the Wilson Observatory where Hubble was located to verify it, and immediately admitted the error of his gravitational field formula, removed the "cosmological constant", and restored the conclusion of a dynamic universe.

According to Einstein's field equations, many cosmic phenomena can be predicted, which can only occur in the case of a dynamic universe, that is, the expansion of the universe. These include black holes, gravitational waves, gravitational lensing, space-time bending, and many more.

These predictions were confirmed by later observations, which are also important evidence of the expansion of the universe.

The so-called galaxy redshift is obtained from the Doppler effect of light.

Before discussing the Doppler effect, let's first understand the nature and characteristics of visible light.

Visible light is the light that our eyes can see, and it is a small segment of the electromagnetic spectrum, with wavelengths between 380nm and 760nm.

But this visible light is not monochromatic light, but composite light, that is, there are several colors to form a collection, people mainly distinguish it into red, orange, yellow, green, blue, purple and other seven colors.

Through the prism, the composite light is dispersed, and we can see these colored lights.

The wavelengths of these seven colors of light are different, with red light being the longest and violet light being the shortest.

The wavelengths of these monochromatic lights are: red 620 760 nm, orange 590 620 nm, yellow 570 590 nm, green 490 570 nm, cyan 480 490nm, blue 450 480nm, violet 380 450nm.