How do neutron stars turn into black holes?

A simple way for a neutron star to become more massive in order to be able to turn into a black hole is to be part of a binary system, where it is close enough to another star that the neutron star and its binary pair orbit each other, and the neutron star siphons off gas from the other star, thus gaining mass. read more

If the star was massive enough, the remnant will be a black hole. If it wasn't massive enough, it will be a neutron star. Now there's another mode of creation of black holes: the neutron star captures enough matter, or two neutron stars collide, and their combined mass creates enough gravity force to cause another collapse - into a black hole. read more

No, neutron stars are completely different from black holes. When a star , not big enough, dies, the mass of the star collapses and gets compressed into small point. read more

In any case, until a compact star turns into a black hole, its mass must be 10 times the mass of the sun (or 10 solar masses), but the Neutron Star is the certainty of any merged star of between 1.5 and 3 solar masses. read more

If neutron degeneracy is not enough to resist the star's collapse it will continue to shrink until the matter is all compressed into an infinitely small, infinitely dense point called a singularity. This is the centre of a black hole. read more