According to these scientific theories, black holes are not the only cosmic phenomenon produced by this process. It is theorized that if the star is less than eight times as massive as our sun, a white dwarf star will be created. It is theorized that if the star were between 8 and 30 times more massive than the Sun, it would collapse into a neutron star. Finally, it is theorized that if the star has more than 30 times the mass of the Sun, it will become a black hole.
Why is all this limited to scientific theories? That is, we will never see the actual process of a star collapsing, so we can only study the aftermath of such an event. Scientists have therefore studied major galactic phenomena such as bella pulsars and crab pulsars and created theories based on the supernovae that most likely brought life to these neutron stars.