What theoretically results when a star dies?
When a star dies a big explosion erupts. The star will then crumble in to tiny microscopic pieces of rock.
A black hole began as a very large star. When this type of star goes into a supernova stage ("explodes" or "dies"), the core collapses in on itself, pulling inwards, and taking anything near enough with it. The density becomes theoretically infinite, as all of that mass becomes concentrated at a single point.
It still remains a star. After a star runs out of hydrogen to fuse into helium, it begins fusing the helium. It continues fusing these progressively heavier elements until it gets to iron. At this point, it cannot fuse the iron into heavier objects and the star dies. How the star dies is really a matter of it's size, but that is another question.
You will know what a star becomes when it dies based off of its mass. If the mass of the star is less than, around, or slightly greater than the sun's mass, it will become a white dwarf. If the mass of the star is a few solar masses, a supernova will happen and a neutron star will be created. If the mass of the star is many times that of the sun, it will…