How do black holes form?

A black hole forms when any object reaches a certain critical density, and its gravity causes it to collapse to an almost infinitely small pinpoint. Stellar-mass black holes form when a massive star can no longer produce energy in its core. With the radiation from its nuclear reactions to keep the star "puffed up," gravity causes the core to collapse. The star's outer layers may blast away into space, or they may fall into the black hole to make it heavier. Astronomers aren't certain how supermassive black holes form. They may form from the collapse of large clouds of gas, or from the mergers of many smaller black holes, or a combination of events.

A massive star has a lot of gravity but the fusion process keeps it puffed out and inflated. When it runs out of hydrogen, it collapses a little till the pressures are enough to fuse helium which burns at a faster rate so it blows out to a red giant for a short while, with a really large star, it can get down to carbon detonation where the fusion produces it's energy very quickly and blows the star apart, that's a super nova. If what's left still has a lot of gravity, it no longer has the fusion to keep itself inflated so it collapses, a black hole is when it collapses all the way.

The gravity of a black hole is no different than the star it once was and indeed is often less as much of the star would've been blown away in the super nova. It's just collapsed indefinitely and matter can get so close that even light could not escape.

Super massive black holes have the mass of millions or billions of stars. It isn't clear how they form as it would take more time than exists since the big bang for that many stellar black holes to crash into each other so they may form by the collapse of giant clouds as a galaxy is formed.

There is no void involved with the formation of a black hole. It doesn't suck, it's not a vacuum.

If a black hole would exist it will follow a sequence of routine initiated by means of a great-nova explosion. A 20 solar mass star, after exploding would go away a remnant that might be about 2 to 3 solar plenty and a diameter of about 100 km,a white dwarf. If the white dwarf accreted any topic,it is gravity would cause it give way into a neutron celebrity. This 2 to 3 sun mass entity would have a diameter of between 16 and 20 km. If the neutron megastar received some mass,such that it can be structure could not maintain it is diameter it might crumple to about 3 km diameter.. The skin gravity can be such that the outside escape pace would be bigger than the pace of light and it would emerge as invisible. Black holes are strictly theoretical entities and there are some compelling factors why they cannot exist.

Considering the exotic nature of black holes, it may be natural to question if such bizarre objects could exist in nature or to suggest that they are merely pathological solutions to Einstein's equations. Einstein himself wrongly thought that black holes would not form, because he held that the angular momentum of collapsing particles would stabilize their motion at some radius.[69] This led the general relativity community to dismiss all results to the contrary for many years. However, a minority of relativists continued to contend that black holes were physical objects,[70] and by the end of the 1960s, they had persuaded the majority of researchers in the field that there is no obstacle to forming an event horizon.

Once an event horizon forms, Penrose proved that a singularity will form somewhere inside it.[27] Shortly afterwards, Hawking showed that many cosmological solutions describing the Big Bang have singularities without scalar fields or other exotic matter (see Penrose-Hawking singularity theorems). The Kerr solution, the no-hair theorem and the laws of black hole thermodynamics showed that the physical properties of black holes were simple and comprehensible, making them respectable subjects for research.[71] The primary formation process for black holes is expected to be the gravitational collapse of heavy objects such as stars, but there are also more exotic processes that can lead to the production of black holes.

A star die it forms a black hole

Black holes exist only in somebody's imagination. The basis of the theory is an assumption that a body can collapse under its own gravitation. One exercise in PHYSICS 101 is to integrate the gravitation inside a sphere. If it is hollow there is no net gravitation anywhere inside. If it is solid then gravitation gets lower as you approach the center, and at the center it is zero. Isaac Newton was the first to point out these things. In real life gravitation depends a lot on the density of rocks and materials nearby, and also on centrifugal force as the body rotates. So the foundational assumption of the black hole is nonsense.

https://en.wikipedia.org/wiki/Shell_theorem

In Einstein’s theory the gravitational field, manifest in the curvature of spacetime, is coupled to its sources by the field equations, the sources being described by an appropriate energy-momentum tensor, and so the Principle of Superposition does not apply. This means that one cannot simply pile up masses in any given spacetime because the field equations must be solved for each and every configuration of matter proposed.

(This paragraph was taken from http://news.yahoo.com/black-holes-may-supermassive... but they deleted it from the article. Apparently somebody couldn't stand the implication of what it said.)

SOURCE: http://www.thunderbolts.info/wp/2012/08/16/a-blind...

A super massive Star Goes Super Nova and collapses in on itself. It's mass is so great and the gravity so strong LIGHT can't escape.

When a huge star dies and it collapses on it self.

This can form a neutron star and a black hole.

When a massive star dies it forms a "Black Hole".

Once upon a time a star got really fat a s**t itself out of its own a**. The end! :)