[FoRK] short-term predictions: 2239 K

Eugen Leitl eugen at leitl.org
Sun Jun 24 04:33:01 PDT 2012


On Fri, Jun 22, 2012 at 03:41:10PM -0700, Joseph S. Barrera III wrote:
> > https://en.wikipedia.org/wiki/Timeline_of_the_far_future for the  
> doom-y details.
>
> "14.4 billion    Sun becomes a black dwarf as its luminosity falls below  
> three trillionths its current level, while its temperature falls to 2239  
> K, making it invisible to human eyes.[43]"
>
> Since when is 2239 K invisible? (I assume we're talking surface temperature)
>
> And why 2239K and not 2240K? We know this to the exact degree?
>
> Something is wrong on the Internet....

I'd say 700-800 K is invisible.


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