How many universes exist?

Image 1. Cosmic microwave background

The fact is that we know only one universe. That only confirmed universe is the universe where our species lives. And there is the possibility that there are other universes. That means those other universes might look similar to our universe. But there is the possibility that the another is forming of antimatter. 

In the antimaterial universe, time moves as it moves in our universe. But the material of that universe is antimatter. And if we would go to that universe that causes the destruction. The fact is that another universe might remain in theory. 

If we want to make observations of those things. We should travel outside our universe for confirming that some radiation will come from another universe. When we are writing and talking about the other universes we are testing the limits of science. And where science ends the hypothesis starts. 

A brief history from the Messier List, to multiverse theory.

About 100 years ago we knew only one galaxy, and that galaxy is the Milky Way. Of course, things like Andromeda Galaxy were well-known as a nebula. 

But people believed that all other galaxies were orbiting the Milky Way and the center of that galaxy was the center of the universe. In the 18th century, The French astronomer Charles Messier (1730-1817) made a list of nebula objects, and that Messier list was published in 1774. In that list. The Andromeda Galaxy is number M31 and M is for Messier. 

But in 1926 Edwin Hubble (1889-1953) showed that the Milky Way is just one galaxy in a group of other galaxies. And that point was the separation of cosmology and astronomy. After Hubble died better equipment is uncovered new and fascinating structures in the universe. Researchers found black holes in the 1990s, and the confirmation of dark energy is opening new visions for cosmology. 

The largest known structure in the universe is the cosmic radiation background. The cosmic radiation background comes from the particles that are sending that radiation. The size of the particles determines the wavelength of that radiation. So the source of the cosmic microwave background is in the micrometer-size particles. The reason for the radiation is the expansion of the universe. 

Light pollution makes it impossible to see other universes. 

This cosmic background might just cover the radiation of the other universes below it. Just like if we would travel on the foggy road where is bright streetlights. Those streetlights are covering the stars. When we are looking at image 2, we see how difficult is to see stars on foggy evenings in bright streetlights. 

The cosmos is a foggy and bright place. And that thing makes it impossible to see other universes. The stars, as well as the galaxies, are covered by plasma clouds. That covers the distant details under them. The size of that plasma could be billions of light-years and they cover those other universes under them. 

The expansion causes the energy level in the universe to decrease all the time. And the pressure of the quantum field that surrounds all particles in the universe will decrease. That causes expansion of the quantum field. 

Image 2

And because the material is at a higher energy level than the universe around it energy travels to the area that is at the lower energy level. That transfer of energy continues until the energy level in particles is the same as the space around it. 

This energy flow causes the material is getting old. And it pushes the edge of the universe away from the point where the Big Bang happened. So the expansion of the universe continues as long as there is material in the universe. Or the energy flow turns so weak that the gravitation wins. 

The possibility that time moves backward in some other universe requires that energy travels to the center of that universe. In that hypothetical universe, the negative energy or energy that travels in the middle of the universe causes that material cannot old. The material will get always new energy. And that will deny that the material turns to wave movement.

Quantum mechanics can boost cosmology.

Also, the ability to connect things like quantum mechanics and quantum gravitation in large-scale structures is opening new visions for the research and knowledge of the universe. But how many universes exist? The fact is that if there are other universes. The starlight of our universe will cover the light that comes from the other universes. 

The thing that covers the existence of the other universes is the cold areas in the cosmic background. Those holes are forming only when high-energy radiation pushes particles away from each other. The thing is that other universes are the next logical step in the findings of the new structures in the universe. 

https://www.messier-objects.com/messier-object-list/

https://www.technopython.com/2021/10/the-multiverse-theory.html

https://www.universetoday.com/77523/multiverse/

https://en.wikipedia.org/wiki/Charles_Messier

https://en.wikipedia.org/wiki/Dark_energy

https://en.wikipedia.org/wiki/Edwin_Hubble

https://en.wikipedia.org/wiki/Messier_object

https://miraclesofthequantumworld.blogspot.com/

Why cannot we see other universes?

There are many arguments against the multiverse theory. And one of them is that we cannot see other universes. 

If we think that the universe where we live is unique we might be the luckiest civilization in the history of time. We would be the only intelligent species in the entire universe. That is the only universe in the dimension. 

When we are looking at the history of those "certainly they have not existed". We might remember that in history Earth was the only known planet. Until Galileo Galilei, Johannes Kepler, and Nicolaus Copernicus proved that Earth was only one planet in the group of planets. 

Then we must remember that Edwin Hubble proved that the Milky Way was only one of the galaxies in a large group of similar galaxies in 1924. He proved. That Andromeda Nebula along with some other disk-shaped nebula. Were too far from us that they could not be inside the Milky Way. So Hubble proved that the Milky Way is not the only galaxy in the universe. 

There is the possibility that light pollution is covering the other universes under them. 

There is the theory that in space are billions of universes. This is called multiverse theory. The theory is that the universe is the bubble that formed after the Big Bang. The Big Bang theory is not closing other universes away, and there is the possibility that in space or our third dimension happens new Big Bangs all the time. But the question is why we cannot see those hypothetical other universes. Sometimes people think that maybe we are living in a black hole. But there is another answer to that question. 

The answer might be found in the image about the highway at the night. When we are looking at that image. We see how so-called light pollution or the light that comes from bright street lights. Cover all other light sources under the bright light. That thing makes the illusion that there is only darkness around that road. So the stars and other radiation sources in the universe are covering the radiation sources in other hypothetical universes under them.

Radio signals that come from the other universes are covered by the radio "noise" that comes from the radio objects in our universe. The pulsars that are in our universe cover those radio signals under their noise. And if a plasma bubble surrounds our universe. There is a possibility that those distant radio sources are too weak that their radio impulses can penetrate our universe. 

In the multiverse theory, the universes are not copies of each other. The energy that forms those universes is a little bit different. And that means the particles of the other universes are a little bit different. That means the particles are sending the radiation with a little bit different frequencies. And that thing causes the effect that the other universes would be very hard to detect. 

There is also a time in hypothetical higher-dimensional universes. 

The dimension is sometimes described as the "floor" between two energy levels. If the energy level of the particle is at a certain slot we can see that particle. But if the energy level is too high or too low we cannot see the particle because it sends radiation the energy level is too high or too low that we cannot see that radiation. 

The difference between the multiverse and parallel universe theory is that the parallel universe theory introduces that the other universes are in different dimensions. That means that the energy level of the particles that are in the fourth dimension is higher. Then the particles that are in our universe. When the energy level of the particle is too high it would jump out from our third dimension. 

The oscillation of the extremely high-energy particles is so different than the oscillation in three-dimensional material that they cannot interact. But even in a hypothetical parallel universe time is like in our universe. That parallel universe expands and those particles will lose their energy. So sooner or later those particles will drop to the third dimension. 

The thing is that particles are also aging in the higher dimensions. The thing that makes those particles young is the energy load that increases the energy loss that causes because by the expansion of the universe. The thing that makes the time will stop in the particle that moves with the speed of light is that the particle cannot remove its wave movement. Because wave movement is traveling at the same speed as the particle that thing causes the particle remains young all the time. 

https://en.wikipedia.org/wiki/Edwin_Hubble

https://en.wikipedia.org/wiki/Four-dimensional_space

https://en.wikipedia.org/wiki/Multiverse

https://en.wikipedia.org/wiki/Spacetime