On a chilly (but above freezing) temperatures on a clear night, you can freeze water outside because of radiative cooling.
By what mechanism do warm bodies on earth actually lose heat to space?
From the Stefan-Boltzmann Law, I know that a hot body loses heat energy at a rate proportional to the 4th power of the body's temperature minus the 4th power of the surrounding temperature.
Obviously that isn't a complete description of what's going on though, since the temperature immediately surrounding a hot fire is quite hot as well, but you (standing far away) can still feel the radiation.
I'm also not clear on how the temperature difference between a body and a space that is hundreds of miles away can affect the real-time radiation rate of that body?