if light doesn't pass through a black hole then how is a black hole identified by scientists and defination also black hole. letest post 2021

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Firstly we talk about black hole, I give you information about the black hole in short. 

Black hole is a space object. It is a region of space time . Where Gravity is too strong That nothing   no  particle  or even electromagnetic radiation such as light. It can escape from it. 

Black hole , creats by  the Star , when the star completed their age , it's mass compressed at a point . Due to high temperature and pressure , increase their density and it converts into a black hole.

According to the size , black hole can big or smallest . Scientist thinks that the smallest black hole are as just one Atom of a matter. Such blach hole are very tiny but have mass of a large mountain . we can't see black hole by our eyes .

 

Another kind of black hole called the "stellar"  . It's mass can be up to 20 times more than the mass of sun . Means  as much as 20 sun's mass . 

(1). Stellar black hole .

(2). Super massive black hole .

(3). Intermediate black hole. 

Scientist think that the smallest black hole formed when the universe began . It means that , according to big bang theory , when our universe made from the sun at that time's some particles remained and they convert in a smallest black hole. 

Stellar black hole are made from the Star when the centre of a very big Start falls in upon itself it's reaction we called collapse. When this happens it causes a supernova. A supernova is an exploding stars that blasts part of the into the space.

Scientist thinks supernova black hole were made at the same time as the galaxy are in.

objects whose gravity fir e is too strong fir light to escape were first considered in 18 century by John Mitchell and pierre Simon lap .

Actually , friends we have already talked about black hole Gravity . There gravity is too strong . The light never escape from a black hole. 

 Actually friends , back hole is Gravity there fundamental laws no work . That's why light can't come out from black hole. Due to high gravitational force of black hole.black hole is largest gravity point in the space . 

Now we taks about the  , if the black hole can't see then how it's indentufied by the scientist. 

As we talked black hole's Gravity , it happens because of gravity. Something like that , when some space objects moves arround the black hole  due to it's Gravity . The scientist observed that stars or other space object are moving but in the centre there is nothing . Black hole can't seen from the telescope , buy space objects are seen . Then they thought  what can there be stay , why are they moving at circular motion. The space scientist called it a black hole. 

Scientist discovered  a black hole nearest the earth  it is 1000 light years away from the earth. It discovered by the ESO (European southern Obeserbatry)   . It is   Obeserbatry situated in the Europ . The scientist discovered it during the HR6819. 

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Friends , we would like to tell you that black hole it too far from the earth . And hole doesn't go in space anywhere. Earth will not fall into the black hole because black hole is too far from our solar system. It is not close towards our solar system. Means no black hole is close enough to the solar system for earth to do that. 

Even if a black hole the same mass as the sun were to take place of the sun.earth still Would not fall in. Our earth and the other planets would orbits.The black hole as the sun right now. 

The sun never turn into a black hole.and the sun is as big enough as to make a black hole.

 

ISRO and NASA is using the satellite and telescopes that are traveling in the space to learn more and more about black hole and others space object. These spacecraft helps the scientist to question and answer about the universe. 

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