> I believe some heat can be lost due to radiation. In hard space all the heat is lost as radiation (minus and incredibly tiny loss from hitting the very few p

> I believe some heat can be lost due to radiation. In hard space all the heat is lost as radiation (minus and incredibly tiny loss from hitting the very few particles in space), the dark side can be treat as a blackbody for a rough approximation. One of the reasons that the side exposed to the sun is mirrored is to reflect as much of the radiation falling on that side as possible as the heat is so hard to get rid off, people think the shiny part is gold but it's actually usually mylar or something stacked in a layered insulation. Space is a horrible environment to make things work, metals spontaneous weld themselves (vacuum welding), radical differentials in temperature depending on orientation, your electronics are constantly hammered by high energy radiation, micro impacts by things travelling at velocities that make a sniper rifle look like a slingshot, it's fascinating as a layman what it takes to keep stuff working reliably up there at all.