Hello forums. Would it be fair to say that the way heat is transferred from one object to another is through different types of electromagnetic radiation? In theory the higher the wavelength of that EM radiation the higher the temperature we can achieve while delivering that radiation to a certain object or piece of matter? Now why i'm asking this is because vacuum is considered a good insulator of both heat and electricity. Technically speaking one cannot heat a perfect vacuum as there is nothing to be heated there (no particles no matter) is that correct? But is vacuum really a heat insulator as the suns given em spectrum still travels through it to reach earth where it can strike air particles etc heat them up and so on.Or is vacuum only good enough for something that doesn' t radiate? As a vacuum chamber would seal off a hot cup of coffee from getting cold that fast but it would still let some gamma and other radiation through from an object which is both hot and radiates like nuclear fuel etc? so if I have some very hot potato for example which would somehow magically give off fast neutrons in the Mev range would there be any " kettle or pot" that could seal those off without getting hot itself from the interactions with those energetic particles?