what is the black hole?

Answer 1

In pregnancy?
you want to know what a black hole in pregnancy is?
Hm, I would like to know that too!

Answer 2

A black hole is a region of spacetime from which nothing can escape, even light.

To see why this happens, imagine throwing a tennis ball into the air. The harder you throw the tennis ball, the faster it is travelling when it leaves your hand and the higher the ball will go before turning back. If you throw it hard enough it will never return, the gravitational attraction will not be able to pull it back down. The velocity the ball must have to escape is known as the escape velocity and for the earth is about 7 miles a second.

As a body is crushed into a smaller and smaller volume, the gravitational attraction increases, and hence the escape velocity gets bigger. Things have to be thrown harder and harder to escape. Eventually a point is reached when even light, which travels at 186 thousand miles a second, is not travelling fast enough to escape. At this point, nothing can get out as nothing can travel faster than light. This is a black hole.

Do they really exist?
It is impossible to see a black hole directly because no light can escape from them; they are black. But there are good reasons to think they exist.

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.

Answer 3

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.

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.

http://en.wikipedia.org/wiki/Black_hole

Answer 4

A hole with black colour.

want more?
see at

Answer 5

Its a hole and its black

Answer 6

Loosely speaking, 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.

Answer 7

a black hole is a region of space with sufficiently large gravity that light cannot escape from it how it happens is stars shine by nuclear fusion and produse radiation that exerts outward pressure to balance the inward pull of gravity.they eventually run out of nuclear fuel and coapse under their owe gravitational pull.stars with mass greater that ~3 times the mass of the sun collapse to a point(singularity) of infinity densit = black hole

Answer 8

according to the Internet, a black hole is a open area in space in which the forces inside of it are much greater than gravity.

Answer 9

its an empty space in space that somehow gas its own gravitational pull and pulls everything it its range insine it insde it
its very powerfull
no one knows where does the stuff pulled in goes

Answer 10

It is located on your back side where the sun don't shine.