[ExI] upon pondering your next million years

[Damien Broderick]

At 10:22 PM 7/14/2008 -0700, Spike wrote:

> > > and so on until beyond, say, Neptunian orbital radius they're down to
> > > shooing away dregs hardly above 3deg K...

Off the cuff recollection, you understand.

>If an M-Brain had a Neptunian orbital radius, then (if I recall correctly)
>Neptune's orbit is about 30 AU, then that's about 6000 solar radii for
>single digit precision BOTECs, square root is about 80, so a Neptune radius
>M-Brain that big would still radiate photons at about 5000/80 or about 65
>degrees Kelvin,

Okay, but that's still 208deg K below freezing point... pretty 
chilly, I reckon.

Damien Broderick