It can actually get really hot in space without some kind of active heat transfer. The body in the suit would probably alternate between freezing and frying. Not a great way to preserve a body IMO.
> The silver suit couldn't insulate and keep the heat out?
If you so wish to believe...
The problem is that there is no air to carry away the heat so that whole setup becomes like a miniature greenhouse. Without some active way to cool it eventually you'd cook.
Heat can transfer via Conduction, Convection and Radiation. The vacuum of space may prevent the first two, but not loss of heat via Radiation. Infrared radiation to be precise. The heat loss is very slow, so yes at times it would be a miniature greenhouse.
Since it’s never really in the shadow of a planet (heliocentric orbit), it’s probably hotter overall.
From the videos I’ve seen, it’s also spinning really slowly. I think you could see off-gassing in some of the videos. I looked into it a little further, and there was speculation it was from the plastics and paint getting extremely hot in direct sunlight.
“Space” is roughly the same temperature (a little warmer near stars with particles and free gas), but the direct solar radiation is what is so hot. Since space is an excellent insulator, getting rid of the thermal energy becomes a problem when you’re not shaded.
If you want to read some more on this, check out what the JWST has done for thermal management. It’s really cool (no pun intended).
