Black hole

 Hello everyone ,Here this is Ajit to introduce you all about BLACK HOLE and in this I will mention these points-

1. What is black hole?

2. Black hole theory of astrophysics?

3. Impact of black hole.

4. Miscelaneous 

1. What is black hole?

 Definition- A black hole is a region of spacetime where gravity is so strong that nothing, including light or other electromagnetic waves, has enough energy to escape its event horizon. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.

My aspects- 

As we know that gravitation force are depends on only the mass . that means those who has great mass it means it has also a strong gravity ,And yes it is also apply on black hole .

- Black hole is almost exist on the center of galaxy like an start but it has no light . It has the properties to escap everything that belongs to its gravity .

2. Black hole theory of astrophysics.

   A black hole itself is invisible. But astronomers can still observe black holes indirectly by the way their gravity affects stars and pulls matter into orbit. As gas flows around a black hole, it heats up, paradoxically making these invisible objects into some of the brightest things in the entire universe.

-- A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying

What is Stephen Hawking's black hole theory?

  -- In 1974, Stephen Hawking predicted that the extreme gravitational force felt at the mouths of black holes — their event horizons — would summon photons into existence in this way.

3. Impact of black hole -

  Black hole only impacts on those things that belongs to its solar system an galaxy , and inact like a vaccumn cleaner and suck all the thing ,even light is also it can escape and after it all the black hole has no tempreture ( almost 0 degree or -273.15k) 

And if we talk about our solar system , so there is no near any black hole is created now .

4. Miscelaneous -

- Hota and his team first spotted this unusual black hole in 2013. In the subsequent years, they observed the strange object using the Giant Metrewave Radio Telescope, located near Pune.

- black holes were predicted by Einstein's theory of general relativity, which showed that when a massive star dies, it leaves behind a small, dense remnant core.

-At 1,600 light years away, the black hole is practically in our cosmic backyard. Gaia BH1 is the closest black hole to Earth that scientists have ever discovered. It is approximately three times closer to Earth than the previous record holder.

-There are four types of black holes: stellar, intermediate, supermassive, and miniature. The most commonly known way a black hole forms is by stellar death

- Princeton physicist John Archibald Wheeler coined the term in the 1960s. At the time, these objects were little more than theoretical talking points, and no one had discovered any evidence that they really existed.

- British astronomers Louise Webster and Paul Murdin at the Royal Greenwich Observatory and Thomas Bolton, a student at the University of Toronto, independently announced the discovery of a massive but invisible object in orbit around a blue star over 6,000 light-years away.

-In the simplest case of a neutral black hole that is not rotating, we should then have S = lnd(M) where d(M) is the number of quantum states of the black hole consistent with it having mass M.  ( Black hole formula by Ramanujan)

- Srinivasa Ramanujan's cryptic deathbed theory has been proven correct and scientists say it could explain the behaviour of black holes.

- When gravitational forces are very strong, for example close to the singularity at the centre of a black hole, the laws of general relativity start breaking down. In these situations, we expect a deeper theory to take over – a theory of quantum gravity.