Brief History of Black Holes
It is called the black hole because light itself is not capable of escaping its gravity pull. It is formed when a star collapses with a mass of more than 3 times the Sun’s. When it reaches the end of its life, it gets crushed under its own gravity, leaving behind a compact black hole. The first prediction was in 1783, John Michell a geologist, conjectured that there must be a massive body in the universe that has an escape velocity greater than the speed of light. And when Einstein published his general relativity paper in 1915; A German astrophysicist Karl Schwarzchild defined gravitational radius of black holes by using Einstein's general relativity equation in 1916 later known as the Schwarzchild Radius. During that period all these were just theoretical predictions without evidence and many other scientists opposed this black hole theory including Sir Arthur Eddington a famous astronomer who helped Einstein prove his Relativity theory by detecting the Gravitational lens. Later in 1935 an Indian astrophysicist, Chandrasekhar pioneered in the theory of white dwarfs that led him to understand the mass limits of the stars and soon he was able to deduce and tell which star would turn out to be a black hole or a neutron star. This particular limit which he deduced was later known as the Chandrasekhar Limit. After his discovery, John Wheeler coined the term "Black Hole" and since it is black it was unable for the astronomers to find it. But it is certainly possible to detect one because each and every black hole converts its energy to radiation and this radiation can be detected by gamma ray detectors. And the first evidence of an existing black hole candidate was Cygnus X-1. Later in 1994 the best evidence of black holes was provided by the Hubble Space Telescope which captured a picture of a Super-massive Black Hole (Largest type of Black Hole) at the center of our Milky way Galaxy.
We all know that the Luna (Earth's Moon) orbits around the earth. And the Earth and the other planets in our solar system revolve around the sun. But have you ever pondered about the Sun? What does the sun revolve around? Is it just static there or is it moving around something?
The answer is that our Sun and other billions of star in our Milky Way Galaxy revolve around a Super-massive Black hole. The reason behind is similar to the reason behind why the earth revolves around the sun; its because of the Gravitational pull. A Super-massive black Holes gravitational pull is extremely intense; and that is why even the fastest (speed of light) itself is not capable of overcoming the gravitation pull of a Black Hole.
Event Horizon
It is a horizon surrounding a black hole most commonly known as "Point of no return" If you were to go close to the event horizon of a black hole its literally impossible for you to get out from there because the gravitational pull is extremely intense and it is impossible to get out from there because even if you tried to get out at the speed of light it wouldn't work; At that point the gravitational pull will be just too intense and you would experience intense gravity acting on your legs than on your head; there is the vertical stretching and horizontal compression due to which you will turn into spaghetti like shapes this particular phenomena is actually known as the Spaghettification in Black hole physics.
Schwarzchild Radius
What if I told you that if you were to compress Earth to a radius of 8mm it would turn out to be a Black Hole! This might be ridiculous but it is certainly true and there is no physical reason why it couldn't be possible. Obviously it isn't possible to compress the earth to that radius you would need a huge compressor and plus humans aren't dumb enough to turn their home into a sucking black hole!
But this particular way to create a black hole out of earth is certainly possible theoretically. As I've already mentioned before Karl Schwarzchild used Einstein's General Relativity equations to deduce his equations. And the formula which he derived was this:
M- Mass of the object
G- Gravitational Constant
c - Speed of Light
Substituting the Mass of Earth and everything you will get radius as 8mm and this by definition is known as the Schwarzchild radius of the Earth a point at which the earth itself will collapse into itself and form a Black Hole.
The Universe is full of mysteries we should try to understand our level best of these mysteries there is always a solution to everything.
"If you want to see a black hole tonight, tonight just look in the direction of Sagittarius, the constellation. That's the center of the Milky Way Galaxy and there's a raging black hole at the very center of the constellation that holds the galaxy together"- Michio Kaku, Theoretical Physicist.
It is called the black hole because light itself is not capable of escaping its gravity pull. It is formed when a star collapses with a mass of more than 3 times the Sun’s. When it reaches the end of its life, it gets crushed under its own gravity, leaving behind a compact black hole. The first prediction was in 1783, John Michell a geologist, conjectured that there must be a massive body in the universe that has an escape velocity greater than the speed of light. And when Einstein published his general relativity paper in 1915; A German astrophysicist Karl Schwarzchild defined gravitational radius of black holes by using Einstein's general relativity equation in 1916 later known as the Schwarzchild Radius. During that period all these were just theoretical predictions without evidence and many other scientists opposed this black hole theory including Sir Arthur Eddington a famous astronomer who helped Einstein prove his Relativity theory by detecting the Gravitational lens. Later in 1935 an Indian astrophysicist, Chandrasekhar pioneered in the theory of white dwarfs that led him to understand the mass limits of the stars and soon he was able to deduce and tell which star would turn out to be a black hole or a neutron star. This particular limit which he deduced was later known as the Chandrasekhar Limit. After his discovery, John Wheeler coined the term "Black Hole" and since it is black it was unable for the astronomers to find it. But it is certainly possible to detect one because each and every black hole converts its energy to radiation and this radiation can be detected by gamma ray detectors. And the first evidence of an existing black hole candidate was Cygnus X-1. Later in 1994 the best evidence of black holes was provided by the Hubble Space Telescope which captured a picture of a Super-massive Black Hole (Largest type of Black Hole) at the center of our Milky way Galaxy.
We all know that the Luna (Earth's Moon) orbits around the earth. And the Earth and the other planets in our solar system revolve around the sun. But have you ever pondered about the Sun? What does the sun revolve around? Is it just static there or is it moving around something?
The answer is that our Sun and other billions of star in our Milky Way Galaxy revolve around a Super-massive Black hole. The reason behind is similar to the reason behind why the earth revolves around the sun; its because of the Gravitational pull. A Super-massive black Holes gravitational pull is extremely intense; and that is why even the fastest (speed of light) itself is not capable of overcoming the gravitation pull of a Black Hole.
Event Horizon
It is a horizon surrounding a black hole most commonly known as "Point of no return" If you were to go close to the event horizon of a black hole its literally impossible for you to get out from there because the gravitational pull is extremely intense and it is impossible to get out from there because even if you tried to get out at the speed of light it wouldn't work; At that point the gravitational pull will be just too intense and you would experience intense gravity acting on your legs than on your head; there is the vertical stretching and horizontal compression due to which you will turn into spaghetti like shapes this particular phenomena is actually known as the Spaghettification in Black hole physics.
Schwarzchild Radius
What if I told you that if you were to compress Earth to a radius of 8mm it would turn out to be a Black Hole! This might be ridiculous but it is certainly true and there is no physical reason why it couldn't be possible. Obviously it isn't possible to compress the earth to that radius you would need a huge compressor and plus humans aren't dumb enough to turn their home into a sucking black hole!
But this particular way to create a black hole out of earth is certainly possible theoretically. As I've already mentioned before Karl Schwarzchild used Einstein's General Relativity equations to deduce his equations. And the formula which he derived was this:
G- Gravitational Constant
c - Speed of Light
Substituting the Mass of Earth and everything you will get radius as 8mm and this by definition is known as the Schwarzchild radius of the Earth a point at which the earth itself will collapse into itself and form a Black Hole.
The Universe is full of mysteries we should try to understand our level best of these mysteries there is always a solution to everything.
"If you want to see a black hole tonight, tonight just look in the direction of Sagittarius, the constellation. That's the center of the Milky Way Galaxy and there's a raging black hole at the very center of the constellation that holds the galaxy together"- Michio Kaku, Theoretical Physicist.