What's Black Hole?

Question

what is black hole, and does it really can make anything that come in it be disappear? Do the other galaxy besides our galaxy also have a black hole?

Answer 1

Q. What is a Black Hole?

Black Hole:
Simply put, a black hole is a super dense object that has an intense gravitational pull. A black hole is a region of space that has so much mass concentrated in it that there is no way for a nearby object to escape its gravitational pull.

There are two parts to a black hole, a singularity and a event horizon.

The event horizon is where the force of gravity becomes so strong that even light is pulled into the black hole. Although the event horizon is part of a black hole, it is not a tangible object. If you were to fall into a black hole, it would be impossible for you to know when you hit the event horizon.

The singularity is not really a tangible object either. According to the General Theory of Relativity the Singularity is a point of infinite space time curvature. This means that the force of gravity has become infinitely strong at the center of a black hole. Everything that falls into a black hole by passing the event horizon, including light, will eventually reach the singularity of a black hole. Before something reaches the singularity it is torn apart by intense gravitational forces. Even the atoms themselves are torn apart by the gravitational forces.

Q. Does it really can make anything that come in it be disappear?

Anything that goes past the event horizon can never come back even the light which moves the fastest. Light can not escape out of a black hole as it can not go pass the event horizon. The event horizon is the point outside the black hole where the gravitational attraction becomes so strong that the escape velocity (the velocity at which an object would have to go to escape the gravitational field) equals the speed of light. Since according to the relativity theory no object can exceed the speed of light that means nothing, not even light, could escape the black hole once it is inside this distance from the center of the black hole.

The particles of light, called the photons lose energy when travelling out of a gravitational field and appear to be redder to an external observer. . The stronger the gravitational field, the more energy the photons lose because of this gravitational redshift. The extreme case is a black hole where photons from within a certain radius lose all their energy and become invisible

Q. ? Do the other galaxy besides our galaxy also have a black hole?

There is very strong evidence that some galaxies have black holes as massive as a billion Suns at their centers. Sagittarius A* (Sgr A*), is the enigmatic supermassive black hole in the center of the Milky Way Galaxy.

There are indications that supermassive black holes exist at the centre of other galaxies. One example is the Sombrero galaxy.

Astronomers have also found evidence of a supermassive black hole at the heart of a dwarf elliptical galaxy about 54 million light years away from the Milky Way galaxy. The galaxy, called VCC128, lies in the Virgo Cluster and is about 1 percent the size of the Milky Way.

Answer 2

A black hole is a collapsed star whose foce of gravitation is so immense that even light cannot escape.
To escape from the atmosphere of any planet or other heavenly body there is a particular escape velocity for every heavenly body.Even light,travelling at 299,792,458 kms/sec is not travelling at enough speed to escape the surface of the black hole.So nothing uptil now has been discovered which can travel more faster than light.So if light cannot escape then any other material cannot.
We cannot see any black hole with a telescope because it swallows all the light and no light is reflected.
When a large star has burnt all its fuel it explodes into a supernova. The stuff that is left collapses down to an extremely dense object known as a neutron star. We know that these objects exist because several have been found using radio telescopes.
If the neutron star is too large, the gravitational forces overwhelm the pressure gradients and collapse cannot be halted. The neutron star continues to shrink until it finally becomes a black hole. This mass limit is only a couple of solar masses, that is about twice the mass of our sun, and so we should expect at least a few neutron stars to have this mass. (Our sun is not particularly large; in fact it is quite small.)
A supernova occurs in our galaxy once every 300 years, and in neighbouring galaxies about 500 neutron stars have been identified. Therefore we are quite confident that there should also be some black holes beyond our galaxy.

Answer 3

A black hole is created when a massive star, dies, having all its mass into a tiny black hole, u should know the greatness of the tiny blackhole with the mass of a whole star in it. We do hav a massive black hole at the centre of our own milky way galaxy. A black hole has GREAT gravitational pull, sucking in everything, even light cannot escape its cluthes. What happens after u get sucked into a blackhole is still unknown, and the chance getting sucked into one is virtually 0, because the nearest one is many light years away. If you really got suced into a blackhole, you will probably die due to spagetthification (stretch)of the gravitaional pull before u reach the event horizon. Yes, our universe is massive, the probabilities of black holes in other galaxies are highly likely.

Answer 4

A star stops shining and emitting light when its fusion of hydrogen into helium stops.In a small star like the sun, this process may take billions and billions of years.But in very giant stars it may last for a few million years as for the massive rate of fusion. At this stage a very big star can collapse very rapidly, causing an explosion. In this stage itis called a supernova.During this stage of the star the outer layers of the star are thrown off .The remaining core of the supernova then attains such a strong gravity that everything is sucked in,even light cannot escape it.Then it becomes a black hole.It is believed that black holes exist at the core of most galaxies .

Many galaxies have black holes.

hope dis helpsss!

Answer 5

yes all galaxies have black holes at their center. a black hole is where their is so much mass in one place that is has such a great gravitational pull that it has actually warped time-space. this does sound science fictiony which is why "black holes" are still a theory. no it cant make anything disappear. it can suck things in at a greater speed than light travels which is why they are so dark and nothing is visible inside. however xrays and infrared rays can escape, because they travel faster than light. black holes form from stars collapsing. our sun will not become a black hole because it is too small. it would need to be 2x to 3x larger to do this. go to the link below. it has many awsome videos and information.

Answer 6

A black hole is an object predicted by general relativity,with a gravitational field so powerful that even electromagnetic radiation (such as light) cannot escape its pull.

A black hole is defined to be a region of space-time where escape to the outside universe is impossible. The outer boundary of this region is called the event horizon. Nothing can move from inside the event horizon to the outside, even briefly, due to the extreme gravitational field existing within the region. For the same reason, observers outside the event horizon cannot see any events which may be happening within the event horizon; thus any energy being radiated or events happening within the region are forever unable to be seen or detected from outside. Within the black hole is a singularity, an anomalous place where matter is compressed to the degree that the known laws of physics no longer apply to it.

Theoretically, a black hole can be any size. Astrophysicists expect to find black holes with masses ranging between roughly the mass of the Sun ("stellar-mass" black holes) to many millions of times the mass of the Sun (supermassive black holes).

The existence of black holes in the universe is well supported by astronomical observation, particularly from studying X-ray emission from X-ray binaries and active galactic nuclei. It has also been hypothesized that black holes radiate an undetectably small amount of energy due to quantum mechanical effects. This is called Hawking radiation.


Simple overview
Gravitational distortions caused by a black hole in front of the Large Magellanic Cloud (artistic interpretation)
Enlarge
Gravitational distortions caused by a black hole in front of the Large Magellanic Cloud (artistic interpretation)

Most planets and other celestial bodies are stable because the Pauli force between electrons prevents atoms from collapsing into each other, while gravity, electromagnetism, and the strong force pull them together. These create a balance which allows material bodies to retain their shape and structure. In extreme circumstances, however, if there is enough matter in a small enough space, gravity ends up winning, and the matter collapses: electrons cannot stay distant from the atomic nucleus, and incredibly dense matter forms (sometimes called neutronium). Eventually, if the star is massive enough, even the Pauli force between nucleons cannot resist gravity and the star collapses into itself further forming a black hole. In a way that can be hard to imagine, nothing can stop this collapse if enough matter gets into a small enough space, and the matter collapses to a point of zero height, width, and depth, known as a singularity, in which the matter is so dense it is no longer "matter" in any real sense, but some kind of anomaly in space. Anything that gets too close to this singularity will also collapse into it the same way, whether it is matter, energy or even light itself, which is the fastest thing in the universe. The failure of even light to escape its gravitation is how the phenomenon initially acquired the name black hole.

Answer 7

A black hole is defined to be a region of space-time where escape to the outside universe is impossible. The outer boundary of this region is called the event horizon. Nothing can move from inside the event horizon to the outside, even briefly, due to the extreme gravitational field existing within the region. For the same reason, observers outside the event horizon cannot see any events which may be happening within the event horizon; thus any energy being radiated or events happening within the region are forever unable to be seen or detected from outside. Within the black hole is a singularity, an anomalous place where matter is compressed to the degree that the known laws of physics no longer apply to it.

The existence of black holes in the universe is well supported by astronomical observation, particularly from studying X-ray emission from X-ray binaries and active galactic nuclei. It has also been hypothesized that black holes radiate an undetectably small amount of energy due to quantum mechanical effects. This is called Hawking radiation.

Answer 8

By definition a black hole is a region where matter collapses to infinite density, and where, as a result, the curvature of spacetime is extreme. Moreover, the intense gravitational field of the black hole prevents any light or other electromagnetic radiation from escaping.

Answer 9

A black hole is said to be a former star, which died and began to suck things inside. Nobody knows where you go when you get sucked in. But, black holes are not proven to be really existing yet. (according to a scientist...) So, we can't say whether our galaxy has a black hole or if other galaxies have them too!

Answer 10

Black Holes do no longer exist. No Probe or spacecraft has ever been close to a minimum of one and no person on planet Earth has ever viewed one up close. it rather is the main ridiculous theory properly-known and dumb sheeple actual have faith what they have been advised by way of scientists and astronomers that Black Holes exists while quite they by no skill viewed each guy or woman they are doing is verifying their very very own version of consequences and records and shoving it in our faces and making opt for us to have faith in this fable noted as black holes.