What is the black hole in universe ?

Answer 1

A black hole is an object with a gravitational field so powerful that even electromagnetic radiation (such as light) cannot escape its pull.[1]

for more details please refer to

Answer 2

All the answers are very good but they're all leaving out one detail...

In the center of a black hole it is theorized that the black hole's gravitational pull is reversed. So the real question is this, Where does everything going into the black hole go once the gravitational pull is reversed. They say things get pulled in and become void....impossible! Without any kind of matter and debris left behind means that matter going in comes out into another universe perhaps. Maybe on the other side of the black hole is a parallel universe of ours.

Unlikely?
Or Likely? hmmmm.

Answer 3

A black hole is an object with a gravitational field so powerful that even electromagnetic radiation (such as light) cannot escape its pull.[1]

Both Newtonian physics and Einstein's general relativity predict the existence of black holes, but:

The Newtonian version incorrectly assumes that photons have rest mass (see History of the black hole concept).
General relativity tells us a lot more about black holes. For example Newtonian physics only explains why an unpowered object cannot escape from a black hole but general relativity also explains why even the most powerful spaceship cannot escape.
Merely having a very large mass is not enough to make a black hole - if it were, most galaxies would be black holes. A black hole consists of mass concentrated into an abnormally small volume. Fortunately Newtonian physics is good enough to explain this fairly accurately:

Newton's shell theorem states that a spherically symmetric body's gravity affects other objects as though all of its mass were concentrated at a point at its center. A simple example of a spherically symmetric body would be a perfectly spherical gobstopper. Stars and even many planets have this type of structure because their own gravity is strong enough to pull any unusually dense lumps into the center. So the shell theorem works very well for them and makes it much easier to calculate the effects of their gravity fields.
The gravitational pull between two objects is inversely proportional to the square of the distance between them (Newton's Law of Gravitation). For example if you halve the distance you quadruple the force, and if you reduce the distance by a factor of 10 you increase the force by a factor of 100.
So a star's or planet's gravitational pull becomes stronger very rapidly as the distance from its center decreases.
In a normal star or even in a neutron star the radius of the outer surface is so large that the gravitational pull at the surface is not strong enough to prevent light from escaping.
So a black hole can only form if a similar mass is compressed into a much smaller radius - so small that the result is not like anything one could reasonably describe as "matter".

Answer 4

A black hole is a concentration of mass great enough that the force of gravity prevents anything past its event horizon from escaping it except through quantum tunnelling behaviour (known as Hawking Radiation). The gravitational field is so strong that the escape velocity past its event horizon exceeds the speed of light. This implies that nothing, not even light, inside the event horizon can escape its gravity. It is, however, theorized that wormholes can provide an exit path for energy or matter. The term "black hole" is widespread, even though it does not refer to a hole in the usual sense, but rather a region of space from which nothing can return. Black holes have made great science fiction mater and have fascinated and grabed the imagination of both amateur astronomers and scientists alike for over 200 years.

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.

Answer 5

There are many many black holes in the universe and one at the approximate center of our Galaxy. Don't recall his name, but there is an Astro Physicist that just came out with a new book called "Death by Black Hole" that covers the subject in detail.

Answer 6

A black hole is a star that has collapsed due to the force of gravity. There is a singularity at the center (a point that is infinitely small and dense) and the pull of gravity to that point is so strong that even light cannot escape the event horizon (the edge of the black hole).

Answer 7

The black hole in the universe is a polite way of admitting that scientists know next to nothing of the universe, its contents or its origins.

Answer 8

Whenever hydrogen gas is fully utilised in stars, stars use to "die" after a great expulsion called "super nova". After this great event, stars use to shrinks and depending upon there density become "neutron stars" or "BLACK HOLES".

We call them "black hole" because they don't even allow light to reflect back and hence we can't see them (We see objects after light from these objects reflect back to our eyes) .

Hence these "dead stars" are called "Black Holes". We can notice and observe these object with some abnormal activities around them but we can't actually see them.There are numerous Black Holes in this universe.

Answer 9

It's a void, a nothing, a vacuum of such proportions, it defies human comprehension. It "sucks up" stars and other matter such as comets, asteroids, etc, floating in it's wake. It is "black" because there is no sun or star to light up the area, it even sucks in light, which then merely disappear as if it never existed.

Frightening, but luckily millions of light-years away.

NB: A light-year is the distance light travels in a year.

Answer 10

If you are asking what a black hole is, do a web search, you will learn more.