- "Presumably the ISS is putting its waste heat somewhere" Giant radiators: http://claudelafleur.qc.ca/images/iss028e005676.jpg http://claudelafleur.qc.ca/ima

- "Presumably the ISS is putting its waste heat somewhere" Giant radiators: http://claudelafleur.qc.ca/images/iss028e005676.jpg http://claudelafleur.qc.ca/images/iss028e005676.jpg https://en.wikipedia.org/wiki/External_Active_Thermal_Control_System https://en.wikipedia.org/wiki/External_Active_Thermal_Contro... Fluid pipes are threaded through them for transferring heat. These contain mixed-phase ammonia: I believe it should condense from vapor to liquid under the radiators, the coldest point. That phase change adds a huge boost to their heat-carrying capacity.