How many truly dead stars (which are not dwarf, neutron or black holes) are there in the universe?
Has there been enough time for ANY dwarf star to truly go completely black and cold?
Has there been enough time for ANY dwarf star to truly go completely black and cold?
Morningfox
Favorite Answer
No, there hasn't been enough time yet. Unless you count white dwarfs, which I don't. White dwarfs have stopped producing energy by fusion, so they are just slowing radiating away their heat. But the oldest white dwarfs are still at a few thousand kelvins.
It will take at least 1 million billion years (10^15 years) for a white dwarf to cool down to 5 K.
nineteenthly
Probably none as of yet because the Universe is not considered old enough. Also, they would never reach absolute zero.
duke_of_urls
Ask that in one of the other universes (in the multiverse) that's several hundred billion years old. Maybe someone there knows the number of them in that universe.
black_lightning
I've never heard of such a thing, the cores of stars don't dissipate the same way as the star's outer shell. The gravity has to turn the cores into something. The closest I know of to completely gone is a black dwarf which is a core which has cooled to essentially a cold black stone invisible against the backdrop of space (our sun's end fate) if you really want nothing, send in a black hole I'm certain it will be happy to finish up the job and gobble up the remains.
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Twenty six