type II supernovae.
In reality, a neutron star that remains after a supernova is a piece of the massive star that went supernova. A black hole can form in one of several ways during the collapse of massive stars that comes before a supernova.
If the star is massive enough, it can instantly form a black hole by collapsing without first exploding into a supernova. If a neutron star absorbs enough matter from a nearby companion star or merges with the companion star, it may be pushed past the neutron star mass limit and collapse into a black hole, creating a new type of black hole.
Depending on how quickly the material accumulates, this process might take a million years or longer. The collapse to a black hole takes place in less than a second once the neutron star has reached the mass limit, which is at a mass of about 3 solar masses.
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