What is the description of a black hole?

Answer 1

One type of collapsed star. In the case of a black hole, the collapse is so extreme, the density is so great, that nothing - not even a ray of light - can escape the black hole, due to the extreme gravity.

Answer 2

A black hole is an object with a gravitational field so strong that escaping its pull once within a certain distance requires going faster than the speed of light, and since doing so is impossible, nothing can escape from one.

• The point at which nothing is then able to prevent itself falling into the black hole is called the event horizon; it is the point of no return.
• The photon sphere is a spherical boundary with no thickness; a photon (light "particle") travelling along the sphere at a tangent will travel.
• According to relativity, at some point within the black hole the mass is collapsed so it occupies zero volume and thus has infinite density (called the singularity).
• The distance at which all matter within that distance will collapse into the singularity is called the Schwarzschild radius.
• General relativity also predicts the ergosphere: the part of spacetime around a rotating black hole that is dragged around with it by the rotating object's motion, like how spinning a ball (the black hole) in a pool of water causes the water ("space") to spin around with it.

When a star is "alive," there is thermonuclear force pushing outward from the star. When it dies, this force from the breaking apart of atoms, ceases, after a huge surge, making the star's huge gravity collapse in upon itsef. Since it has so much gravity, the electromagnetic force, that keeps molecules together, stops working and is overcome by gravity. Eventually, even the strong nuclear force, which holds atoms together, collapses and all the matter from the huge star collapses into a single, geometric point. A black hole really has no size - it is infinetly black. Since it has so much gravity, everything, including light, is sucked into it. The "black" part you see of it is the event horizon, which is the point where there is so much gravity from the black hole that even light, the fastest thing in the universe, cannot escape.

Stars want to expand when they are active, but their high gravity keeps them the right size. When stars are too old they stop expanding, and its gravity makes it very small. If an object has too much mass for its size, it is a black hole.

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Answer

Here's an quite simple explanation of what a Black Hole is. An Black Hole is a theoretical entity predicted by the equations of general relativity A black hole is formed when a star of sufficient mass undergoes gravitational collapse, with most or all of its mass compressed into a sufficiently small area of space, causing infinite spacetime curvature at that point (a "singularity"). Such a massive spacetime curvature allows nothing, not even light, to escape from the "event horizon," or border.

Answer 3

A place where God divided by zero. A frozen star. The universe's strongest vacuums. It's a star that has died and was heavy enough that it collapsed in on itself, now absorbing anything that it can attract.

Answer 4

A black hole is a bunch of hyper dense matter and at the center of it is a singularity, a point in space infinitely dense, not even light can escape it, that's why it appears pure black or invisible.

Answer 5

its a dead star,

when a star becomes dead it compressed inside and turns into 1 atom that atom has a huge gravitational field.

Answer 6

it is an area in space that has the most powerfull gravity pull. Nothing could escape to it once it has reached the hole. Not even light could escape and that is why they are black.