Re:We've spotted a planet surviving its dying star
by kijin on Friday October 15, 2021 @12:20PM
(#28879487)
There's no hard threshold, the star just fades gradually from #FFF to #000.
A fully black dwarf would be so cold it would be indistinguishable from cosmic background radiation, but that's going to take at least a trillion times longer than the current age of the universe. Not just slightly longer.
Re:We've spotted a planet surviving its dying star
by kadoban on Friday October 15, 2021 @01:02PM
(#28880084)
Right. I'm just saying that if the are any black dwarfs (which there should not be), we should be able to find ~arbitrarily dim ones as well, down to our ability to see.
A fully black dwarf would be so cold it would be indistinguishable from cosmic background radiation, but that's going to take at least a trillion times longer than the current age of the universe. Not just slightly longer.