this post was submitted on 22 Jul 2025
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xkcd
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Space is hot because the average kinetic energy of particles is very high. Space feels cold because there are very few particles in a vacuum. It's like a tiny spark from machinery being very hot individually, but because the spark is so small, it doesn't do much energy to your body.
Sorry, I think I understand the video but my question was only tangentially related
Having said that , there is about a thousand watts per square metre of insolation coming in from the Sun on the exterior of the craft, just like there is here on the ground on Earth.
I guess the Apollo designers figured it was easier to insulate and heat the cabin than absorb heat and then try and cool it.