Question: what is the difference between a white dwarf a neutron star and a black hole?
Answer: Neutron stars are city-size stellar objects with a mass about 1.4 times that of the sun. If the mass of the star collapsing is much more then it would form a black hole. ... Large black holes have a density less than that of a neutron star. So they do not need to contain a singularity (only e.g., neutron stars).