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Since we know white dwarfs are made of electrons and neutrons stars are made of neutrons and quark gluon plasma. What can we say about the black hole in this sense since its properties are far stranger to any object in the universe? Can we say it is made of some exotic particles which we don't know of yet?

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  • $\begingroup$ Re, "white dwarfs are made of electrons." That doesn't sound right. Wikipedia says they are made of electron degenerate matter which is mostly made of equal numbers of electrons and protons. $\endgroup$ Apr 25 '18 at 13:20
  • $\begingroup$ @jameslarge You are almost equally incorrect. It is ions (bare nuclei) and electrons. $\endgroup$
    – ProfRob
    Apr 25 '18 at 13:25
  • $\begingroup$ A proton is an ion, but I suppose you are telling me that there are other nuclides present as well. Makes sense. $\endgroup$ Apr 25 '18 at 13:29
  • $\begingroup$ Possible duplicates: physics.stackexchange.com/q/401668/2451 and links therein. $\endgroup$
    – Qmechanic
    Apr 25 '18 at 13:33
  • $\begingroup$ @jameslarge there are almost no free protons in white dwarf stars. $\endgroup$
    – ProfRob
    Apr 25 '18 at 13:44
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We don't and can't know what form matter is inside a black hole.

We can take an educated view of what form the matter is in as it crosses the event horizon, but after that its fate is hidden.

Using General Relativity, it gets squashed to an infinite density at the central singularity - presumably passing (very briefly) through similar phases as exist inside white dwarfs and neutron stars as it does so.

However, nobody thinks that GR is the last word on this matter and some sort of quantised gravity theory will be required to describe what actually happens. Whether or not such theoretical predictions will ever be testable is speculation.

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