# Theory of Relativity and Black Hole

## Einstein and Black Hole

Do General Relativity is connected to Black Hole? If yes then how? Today, we will try to get the answer.

Now, what is General Relativity?    upper photo credit- NASA

General Theory of  Relativity is a geometrical representation of gravity.  When we put mass on the fabric of space-time the gravity is generated. In a practical aspect, Newton’s gravity is best. When it comes to explaining the motion of planets from our solar system newton fails. Here comes Einstein in the picture. General Relativity explains the motion of our solar system.

General Relativity is represented by

Rμν  = Ricci Tensor
R=  Ricci scalar
gμν = Metric Tensor
Tμν  = stress-energy tensor

Actually this is not just a single equation. These are Einstein Field Equations which is a set of ten equations.

Recently LIGO has detected gravitational waves. That gravitational wave gives hint about the existence

Image from the LIGO

of General Relativity. Some scientists believe that gravitational waves were created by the collision of two Black Holes. Back in 1915 when Einstein introduced General Relativity it was tested in solar eclipse by Eddington in 1919. General Relativity has passed all the tests until now.
Karl Schwarzschild got the solution of Einstein field equations which gives description about point mass. After many physicists give a solution to Einstein field Equations that found the object. An object that nothing can escape from that due to its gravity. That object is nowadays known as black Hole. Black Hole is having too much strong gravity.

When something falls in Black Hole the information of the object is destroyed. Black Hole is having regions like event horizon and singularity. The event horizon is the boundary of space-time from which nothing can escape. Singularity is located at the center of  Black Hole. Singularity smallest point of mass in space-time. All the laws of physics Breakdowns at Singularity.
To form a Black Hole we just need to compress physical size less than the event horizon. Our sun will be converted into Black Hole if its compressed to a radius of 3 kilometers.
The first image of Black Hole is just released. We First-generation ever to witness the First image of Black Hole.  So there is no doubt about the existence of Black Hole.

### 6 thoughts on “Theory of Relativity and Black Hole”

• April 17, 2019 at 2:14 pm

Answer me how they take a picture of a black hole ,
Light are not possible to escape from it . Nothing can escape from it. Then like this type of object black hole , how can they take a picture of it….Pls answer me soon

• January 11, 2020 at 8:20 am

Light isn’t coming from the black hole itself, but the accretion disk just outside the event horizon surrounding the black hole. It has a high turbulence & the debris in it collide with each other with very high kinetic energy. This accretion disk , due to its storming debris gives out low wavelengths of light ( not visible light) & then captured by us & replicated the data in the form of an image.
P.S.- If anything wrong, please do tell.

• March 31, 2020 at 4:12 am

It is not only debris but accelerated particles which are created after the supernova. The immense energy is also from light which travels at a high speed around the accretion disc.

• January 11, 2020 at 12:57 am

Might the Singularity at the centre of Black Holes be spawning new universes? If so, diminishing returns? What of WhiteHoles?

• January 11, 2020 at 1:06 am