Wouldn’t it be the opposite? Because with nothing to impede the heat dissipation, wouldn’t it dissipate faster instead of slower?
In: Physics
There are a few ways that heat can be transferred from one place to another. By far the fastest is direct contact of materials in convection and conduction. Vacuums completely eliminate these.
Also worth noting is that insulating material doesn’t stop radiation any more than a vacuum does.
Edit: I just realized that the OP didn’t use the word radiation so I should explain what it means. Radiation is the process by which particles with a lot of heat energy turn some of that energy into photons which can travel through space and heat something else up. Radiation is the only way to transfer heat through a vacuum, and is much slower than direct contact of materials where photons aren’t needed at all.
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