what is black hole?

Answer 1

It's a common nickname for the McAfee Coliseum in Oakland, CA. Go Raiders!!!

Oh wait, wrong page.

A black hole is the remnant of a super-massive star that has collapsed under its own gravity. No known matter is dense enough to stop this collapse, and thus a black hole is a singularity - a place where the known laws of physics just don't apply anymore. It can't just collapse forever, can it? But if not, what is at the center?

The velocity of light is less than the escape velocity of a black hole, which is why they are black (no returning light) and so hard to observe unless they are in the process of "eating" a star.

But black holes do emit high energy particles from time to time, erupting from their north and south magnetic poles.

The Black Hole is the best place to see a live sporting event, ever. The Raider Nation can shake the entire stadium and the Oakland Police (who kick butt and take names, by the by) have to prepare for riots after big games - whether or not the Raiders win! How awesome is that?

- Cai

Answer 2

A black hole is a concentration of mass with a gravitational field so great that nothing can escape it-not even light. As an object grows closer, the speed (energy) needed to escape increases until it passes across the event horizon and becomes infinite. The gravity is thought to be so strong that, within the event horizon, spacetime itself is warped.
A black hole by its very nature can't be observed directly, but its effect can be seen through circumstancial observation, like studying the X-ray emissions from X-ray binaries and active galactic nuclei.

Answer 3

It is a theoretical concept of mass being able to be compressed to such a degree that it forms into another state of matter. The problem arose when Einstein proposed that the movement of mass was mass compounding. He was mistaken. Mass converts energy at right angles to direction of movement into the direction of travel. Were black holes able to exist, our sun would have one in its center.

The reason for the above is at, http://timebones.blogspot.com
Check out, "The Problem and Repair of Relativity." The information is two pages long and easy to read.

Answer 4

its a sphere in space where gravity is so strong nothing, including light, gets out once whatever it is is drawn into it. its really a black ball, not a hole.

Hawkings, made his claim to fame by theorizing that some energy does get back out of the black ball due to quantum physics phenomina. some measures and observations have confirmed that; which is why Hawkings is famous.

many astophysicists agree that the laws of physics, as we know them in our universe, may break down in a black ball. one can only speculate on how time will behave inside the enormous pulls of gravity for example.

Answer 5

a hole thats black =]

Answer 6

Paris, August 2nd, 2006

May I suggest

http://www.atlasoftheuniverse.com/

nils