Is it true that black holes are constituted by neutron stars ?

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If it is so , then is possible that its mass will be far more greater that a body made up of other particles like proton and electron . (I mean , is it true that the mass of millions of neutrons will be more then the total mass of millions of protons and electrons . )
 
neutron is the corpse of a dead massive star

black hole is the corpse of a dead very massive star


kind of like young elvis and old elvis
 
Firstly, when a black hole forms, it no longer contains neutrons or any other kind of material. Everything is destroyed inside an infinitely small singularity in the centre of the black hole.

But you're correct about the relative masses of electrons, protons and neutrons. Electron mass is much much smaller than mass of protons or neutrons. Neutrons are the heaviest of all three particles.

Neutron stars are actually composed not just of neutrons, but also atomic nuclei (protons and neutrons) and some electrons. But the pressure in them is so high that the electrons are pushed into the nuclei and combine with the protons to form neutrons. The more massive neutrons can be packed together more tightly than the electrons or protons could.
 
Neutron stars form because neutrons are able to survive the pressures of gravitational collapse during Type II, Type Ib or Type Ic supernova events. That's why it is made up almost entirely of neutrons, hence the name...

If the mass of a neutron star exceeds 2-3 solar masses it could collapse again into a quark star, at 5 solar masses, a black hole is inevitable.
 
A neutron star lacks enough mass to become a black hole, and doesn't even approach the density required for all of the mass to collapse and begin sucking in raw energy.
 
they can be ancient stars that collapse in on themselves, sometimes they get relatively cold like a white dwarf, but they shrink even more, and get to the point where gravity is so great not even light escapes from them. they can be a singularity where time is space...but i dont really get it
 
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