> I wonder what would be the mass that'd keep a black hole in thermal equilibrium with the current background radiation... About 4.5e22 kg, i.e. about 60% the

> I wonder what would be the mass that'd keep a black hole in thermal equilibrium with the current background radiation... About 4.5e22 kg, i.e. about 60% the mass of the Moon. Note that over time, the CMB will cool and the equilibrium will be broken.