When a star is at his end of his life, it expands. It will gradually expand till its own weight is to big to carry and the star implodes.
A black hole isn't a hole, as many people think, but a object with an extremely high density, with such a high gravitational force that not even light itself can escape from it.
The imploded star is such an object; it is a object with an extremely high density and therefore a large gravitational force. Only big stars can form black holes, cause they only have a large enough mass to form such a high density.
Black holes are the result of the gravitational collapse of a large star.
Theoretically they can be as large as a small star or as large as a galaxy
Black holes are the result of a large star that has collapsed.
The most massive stars will die as black holes.
Usually at the center of a galaxy or where a large star has exploded.
A dead or dying star will start to create a black hole
Virtually all the ones we know anything about probably formed as the result of the death of a very large star, or at the centers of galaxies. Most if not all galaxies have super massive black holes at their centers.
Yes, both black holes and neutron stars are remnants of the death of massive stars. Neutron stars form when the core of a massive star collapses but does not produce a black hole. Black holes are formed when the core of a massive star collapses beyond the neutron star stage.
The relevant magnitude is mainly the black holes' mass. Since black holes are the result of collapsing stars, yes, there are black holes with the mass of a star.The diameter is usually taken as the diameter of the event horizon. This diameter is directly proportional to the mass; a supermassive black hole such as Sag A* has a diameter comparable to that of a large star.
black holes can be formed in a supernova explosion if the mass of the star is largeenoughusually they are created when a massive and dense star like a neutron star collapses
The star must be fairly massive. The large majority of stars won't become black holes. The condition to become a black hole is that what remains of the star after the supernova explosion must have at least a certain mass, something like 2 times the mass of our Sun.
black holes