> blackbody radiation, which some certainly is, but that is limited and isn't much. Boltzman equation has temperature in the 4th power, so it is quickly become

> blackbody radiation, which some certainly is, but that is limited and isn't much. Boltzman equation has temperature in the 4th power, so it is quickly becomes a lot. https://en.wikipedia.org/wiki/Thermal_radiation https://en.wikipedia.org/wiki/Thermal_radiation "Using the formulas below shows a human, having roughly 2 square meter in surface area, and a temperature of about 307 K, continuously radiates approximately 1000 watts." At the temperature that you can keep your electronics at, say 60C, it would be 700W/m2. So, for example a GPU mining ethereum in space (where i think we're ultimately heading toward with the crypto) would need a heat radiator only 3-5 times the size of the GPU.