Qua intuition: Think vacuum flask aka thermos flask. (though these also try to reduce radiative cooling with a mirror-finish) Convective cooling is a very effi

Qua intuition: Think vacuum flask aka thermos flask. (though these also try to reduce radiative cooling with a mirror-finish) Convective cooling is a very efficient form of cooling, but obviously doesn't exist in a vacuum. Typically people resort to radiative cooling in space. This requires larger radiators.