Why are black dwarfs hypothetical at this point?

1 Answer
Nov 30, 2015

Simply because it would take longer than the current age of the universe for a white dwarf to cool to the point of being a black dwarf.


Black dwarf is the term for a white dwarf that has cooled to the point that it no longer emits significant radiation. It is calculated that this would take somewhat longer than the #13.8# billion years that have elapsed since the Big Bang. Exactly how much longer is debated and depends on a number of factors, but would probably take about #10^15# years.