What is a black hole?

Question

Hi,
Do any of you folks think you could tell me WHAT exactly a black hole is?

Thankyou very much!

Answer 1

no, but i can tell you what we think it is:

it is a star whose gravity is too great for the nuclear fusion in its core to negate. it collapses in on itself and goes supernova. then it is a neutron star. if the gravity is still too great, it collapses some more and becomes a black hole. its gravity is so strong that light itself cannot escape it (thus it is 'black'). they are suspected to be at the center of many galaxies, especially quasars and other active galaxies. one is believed to be at the center of our own galaxy, the milky way.

once again, no one has really seen one, just the indirect evidence that one exists (strange star orbits, gas being sucked into nothing, strange bursts of some kind of rays (can't remember what kind) coming out of the poles, etc.

everybody is pretty convinced that they exist. its just kinda hard to prove.

ps the idiot down there who said black holes are dead galaxies has no clue what he is talking about. please ignore him. and its not the size of an atom, its an infinitely small point, the swartzchild point.

Answer 2

A black hole is an object predicted by general relativity[1] with a gravitational field so strong that nothing can escape it — not even light.

A black hole is defined to be a region of space-time where escape to the outside universe is impossible. The boundary of this region is a surface called the event horizon. This surface is not a physically tangible one, but merely a figurative concept of an imaginary boundary. Nothing can move from inside the event horizon to the outside, even briefly.

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 energy due to quantum mechanical effects known as Hawking radiation.

You could get more information from the link below...

Answer 3

I watched this documentary on discovery. And if I remember precisely:

It is the remains of an exploded(dead) galaxy. And the energy was so great that all of them shrunk to a size so small. If I am not wrong the size of an atom. From here there are these facts.

The heavier the thing, the more gravity it has. Such as the earth which is so big, and we are bound by its gravity. The sun, like wise, is bigger than the earth and has more gravity than it. But in a blackhole's case, it is packed into such a tiny spot. I forgot why, but that makes it greater.

Now, it attracts anything that comes close to it. Even light cant escape from it. That's why it's black I think.

Answer 4

Black holes are generally considered to be massive star like objects ( they used to be called black stars) in which the (escape velocity) gravity at the surface is greater than the speed of light. The exact composition is disputed because we are not sure how matter behaves at such high densities

Answer 5

It is a very larg gravity area in space which can absorb any thing even the light,so the light cannot escape from it,that is why it is black.

Answer 6

it is a small bit of mass which has minimum volume with maximum density and gravity