Cosmic Voids

We had talked about such areas in space where galaxies do not exist. Yes, these are those areas that are visible from a distance without light, like maybe load shedding. These areas are called voids and it is equivalent to the absence of galaxies here. Although voids were investigated in the 1970s, it took a long time for scientists to believe in them. In 1986, Harvard University confirmed that Voids exist. Thomson and Krishna first told us about voids.

 

And then after doing an experimental survey, he said that after analyzing the data, what we had thought about in the 70s actually exists and the voids are not just one or two, but now we have started seeing voids everywhere in the universe. If there are, then there should be maps of voids also. When we are making maps of the galaxy, we are breaking the universe into clusters and superclusters and classifying them, then there should also be maps of voids. Juju, we are seeing more and more in the universe. We can see that void is a very big part of the universe if we

 

If you look at the universe in a big picture, I am showing you an image here and this image is of the universe where you are seeing a web, you are seeing a web, you are feeling as if a spider has laid a web. Yes, it is called Cosmic Web and these are those areas, especially the web that you are seeing, these are those areas where matter is very concentrated, where there are many galaxies, where there are solar systems, where there are black holes, these are those threads. The glowing strings you see are the areas where we find things made of visible matter.

 

Which is on 5 of our universe but inside this web you will also see many such areas which are black in color, these are very big voids, so now you can see that the cosmic web is full of voids, exactly like this Just as various roads are running in our cities and you can see empty spaces in between them, I will illustrate it to you with another model and that is Swiss cheese. Swiss cheese is different from the normal cheese because inside it there are large pieces of cheese. There are holes. Now the question is, what was there in the Swiss cheese model that made such big holes?

 

There is a lot of thinking going on about what created such huge holes in the normal matter. One famous character is Dark Matter. Yes, dark matter about which Frits Waukee had told us in the year 1980 that such a substance exists in our universe. It also exists, which is very high and secondly, it weighs a lot because Frits Vicky observed a galaxy from a long distance and measured its angular rotation, its angular speed, and calculated its mass according to its weight. When I looked at it, I came to know that it is rotating very fast and there is not so much mass there as

 

It is moving fast and especially if you come towards the outside of the galaxy, you can see two curves here, one which is actual and one which they saw experimentally, so after all, this much rotation is getting faster, which means that That its mass is very high, where is that mass? He believed that the galaxy he talks about has about six times more mass, but from what we can see in the visible light, it seems that one unit of mass is required. Do it, but from the angular speed, it was estimated that it had six units of mass. Now where was the rest of the mass?

 

The thing that makes up the rest is called dark matter. We can't measure it. We can't see it. We can't interact with it. Just like you look at a Christmas tree at night, you see lights on top of it. The glowing lights are visible but below what you see is a scaffold which is the tree itself on which you have placed glowing lights. The entire tree is dark matter and the glowing lights that you have placed above it are absolutely visible matter. In this way, we come to know from gravity that in our universe

 

Dark matter exists and is the underlying scaffold. It is hidden below and on top of it, the visible matter is creating a beautiful atmosphere. There are various pathways, so scientists have now realized that dark matter is underground, and along with it We came to know that white matter is visible above it and the same things are visible to us in the form of pathways but at the same time there are voids. Initially, we ignored the voids because we were more concerned about the visible matter. And then went towards dark matter We never used words

 

We also did not take it seriously, but now slowly we are realizing that words are very important, they can tell us about the Big Bang, they can tell us about the structure of the universe, they can tell us about its nature. Because the voids here are of different shapes, their structure is also different, their shape is also different, so now we want to get as much data as possible about them, we want to get as much information as possible, we want to make a map of them, we want to see that where are the voids

 

Taking data on where the voids are big, where the voids are small, where they are close, where they are far away, and then what difference their presence around them is making is a very important task. It is a big issue, what is the reason for it? The reason for that is that like the universe, the voids are also expanding slowly, so the universe is expanding, and the voids are also expanding. Now when the voids are expanding, we can know by the arrival of light. When the light comes to us from a distant galaxy and the universe is expanding and space-time is also expanding, then gradually its wavelength starts increasing.

 

When it goes away and it becomes red color, then the light starts from supposed white color to yellow color and it slowly comes to red color, then we come to know that this galaxy which we are seeing is moving away from us. Now if that galaxy is further away from us, then it will shift more. I am also showing you the spectrum here, so you can understand that a supernova occurred in the visible light, and after that the light reached us, so now the light gradually increases. Because the space is increasing, what will it be first, it will go in red color

 

In the visible spectrum, yellow color, orange color, and then it will move to red color. After the red color, if it fades and still does not reach us, then it will move to infrared. That is why the James Webb telescope looks at infrared bands because it wants to see very old galaxies. Which wants to see those galaxies that were formed after the Big Bang, that is why we have taken it to the infrared region. We did not keep it in visible light, so now as the light increases, it goes into infrared. There is still no sensing telescope for it. If she doesn't get it then she will grow even more.

 

Gradually it will go into the microwave and we remember that the cosmic background microwave radiation came into existence along with the Big Bang, when the Big Bang happened, that it was radiated and now we are getting it in the microwave spectrum. I am showing the same thing here, the light that is coming to us is slowly shifting and is changing its shape, its color is also changing and at the same time it is also giving us information that it is Coming from so far away, but when this light comes to us from the void

 

So we have to face a big issue and that issue is that we cannot get information about the void, this light gives us wrong information about the voids due to which it is very difficult to read the voids.