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As far as i understand, black holes radiate away energy in form of Hawking Radiation. Thus, they lose mass, i suppose. Is there a point where the mass becomes too small for the object to still be a black hole? What happens then, will it turn into a neutron star supported by degeneracy pressure? Or is it all about density, and once a black hole is formed, it will stay a black hole (i guess until it completely radiates away)?

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  • $\begingroup$ No, it eventually will evaporate into nothing, but for the sun's mass black-hole you need about 10^67 years for that. So clearly nobody in the universe will out-live massive black holes. However, micro black-holes with the mass of electron will evaporate into nothing almost instantly in the blink of eye. $\endgroup$ – Agnius Vasiliauskas Aug 19 at 12:42
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I think that once a black hole forms then that is it, because although its mass is finite, its density (in GR) becomes infinite at the central singularity. The loss of energy(mass) will then result in a shrinkage of the event horizon but no change in the black hole nature - the BH nature of an object is not determined solely by its mass, the density of the object is crucial.

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