Blackhole. It is a demon of the universe who has hidden many secrets inside it. Today we are going to investigate each mystery of the black hole, black hole collision in this article. We are going to discuss black holes in detail. John Michell was the first person to reveal his thoughts about black holes in the world. He was a teacher at Cambridge University. And in the year 1783, he gave his views about the black hole. Then in 1796, a French scientist, Pierre Simone, talked in detail about the black hole in his book ‘The System of the World’.
A black hole is a body of the universe whose gravity is so strong that even light cannot go beyond it. And it swallows everything approaching this black hole in space. Not only that, the closer we are to the black hole, the shorter the time. And time has no existence inside a black hole. So let’s know how such a dangerous body originated in the universe.
A black hole is a body with very high density and mass. If we compress any object in the universe and make it very small, then its mass, density, and its gravity will increase so much that it will not be possible to go out of light. And that thing will be called a black hole. If the density of our Earth increases greatly and the entire Earth is compressed to just 1.5cm by compression. Then its gravity will increase and it will become a black hole.
If our Sun, which is 1300000 times larger than the Earth, is compressed and made into the size of the ball. It will become a black hole. But keep in mind, in the case of black holes, density is much more important than mass. As we know that Earth and Sun cannot be compressed in this way.
Because neither the mass of the earth nor the force of gravity is so much nor that of the sun. But it is millions of times larger than our Sun. A star whose density and mass are so high, it can become a black hole due to its characteristics. And often black holes are formed by mixing the stars. But first of all, we understand how the stars are composed.
Actually, stars originate from particles of gas and dust present in the universe. These gas clouds present in the universe are called a nebula. Hydrogen content is highest in these nebulas. And about 25% is helium. And there are also some heavier elements in very small amounts. When the density of these clouds made of dust and gas increases.
At that time, this cloud starts shrinking due to its gravity. And the heat inside it increases so much that hydrogen molecules start moving on their own. They form the nucleus of helium. And due to movement and contraction, they begin to take a round shape. But many millions of years go into this process. Sun was also constructed in this way. And so the heat of these stars keeps their gravity control under.
Therefore, when the hydrogen present in these stars starts to dissipate, that star starts to cool down slowly. And because its fuel is exhausted. The value of the substance also decreases, and due to this they are unable to handle their gravity and it explodes.
After this explosion, if any dense residue of that star survives, then it becomes a very dense neutron star. Due to the immense gravitational force in such stars, it shrinks, and eventually, the star narrows to a certain extent. And because of this immense and extraordinary contraction, its location and time have also become distorted. And it disappears. These are invisible bodies that we know as black holes. The mass of a black hole is concentrated on a small point. This is called the Central Singularity Point.
The location or horizon around this point is called the event horizon. No light or anything else can go beyond this event horizon. And time is also not present here. According to Einstein’s Special Theory of Relativity, observers of this black hole will feel standing at a certain distance from the horizon, moving their clock very slowly. And time will be very slow.
Remember that time is absolute and the time is at different speeds in different places of the universe. This means that the time moving on the Earth, and the speed at which it is moving at some other place in the universe is moving faster or slower. Known as Time Illusion.
You may or may not agree, but this is an interesting reality. Whatever falls inside the black hole will split into molecules. And it will slowly disappear and go to some invisible location of the black hole. Physicists do not know anything about it yet.
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Black Hole Collision
Astronomers keeping an eye on astronomical events and rare processes have made a surprising discovery. Astronomers have detected black hole collision. This event is the most powerful and farthest incident ever. When the age of our universe was half of what it is today, this phenomenon has been detected through gravitational waves. The special thing is that when black hole collision occurred, the mass of one was so much that it is unique to be involved in this incident.
The black hole created by the black hole collision of two, its mass was equal to 150 suns. No black hole was seen in this range before. In the science journal Nature, computational astrophysicist Simon Portgis of the University of Leiden, Netherlands, says that everything about this discovery is shocking.
He said that along with this discovery, evidence of the presence of black holes of ‘intermediate-mass’ has also been found. These are larger than stars but smaller than supermassive black holes. This mass is a major reason due to which the process of its formation is considered different from the traditional method.
The incident of a black hole collision was detected on May 21, 2019. With the help of a detector mounted in the Laser Interferometer Gravitational-Wave Observatory (LIGO) of the US. Apart from this it was also seen at Virgo Observatory in Pisa, Italy, and named GW190521. Since 2015, both of these observatories have been sensing gravitational waves. With the help of these, black hole collision can be detected which common telescopes cannot see.
Types of Blackhole
There are many types of black holes in the universe.
1. Stellar-mass black hole
A star whose mass is a few times larger than our sun and due to gravitational contraction that eventually became a black hole is called Stellar-mass black hole.
2. Supermassive Blackhole
Black holes form in the center of the galaxy. Those that have a lot of density and are very large. Known as a supermassive black hole. The mass of such a black hole is millions of times greater than our Sun. There is a supermassive black hole in the middle of our Galaxy Milkyway, whose mass is 10 million times that of our sun.
3. Primordial/small blackhole
There are some black holes whose mass is less than our Sun. And those which are not formed due to gravity contraction but due to the combination of matter and heat present at its center. Known as primordial/black hole. Regarding these black holes, scientists believe that they would have formed with the creation of the universe.
According to physicist Stephen Hawking, we can learn many things about the universe by studying such black holes. Friends, many of you should have the idea that black holes absorb light. And do not reflect being invisible in the universe. How do scientists then find out the black hole?
According to Michell, blackholes, despite being invisible, exert their gravitational effect on nearby celestial bodies. In such a situation, it remains dark and it seems that things around it are pulling towards it. Sometimes two stars or two planets appear orbiting each other. There is a huge black spot in the middle. So, there is confirmed to be a black hole. Sometimes a black hole appears to pull or swallowing any star or things present in space.
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Now we will learn some more things about the black hole in brief.
Black holes do not actually have any holes, instead, they are remnants of dead stars. After millions of billion years, a star ends and it is born as a black hole. Remember here that black holes are not formed after all the stars die but in some cases. Black holes do not leave any object around them. They can pull any planet, small planet, comet, star, or entire galaxy. It should be noted here that the black hole will swallow anything that comes in its gravitational cycle.
But it cannot take anything outside his gravitational range. But the first black hole discovered by scientists was Cygnus X1. Scientists at South European Laboratory have found the largest black hole ever discovered. This black hole has taken 14% mass inside its host galaxy ADC1277. Scientists have received a lot of information about black holes so far. And there have been many experiments in the research of his discovery. Will continue to happen even further.
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