Thank you! Vacuums are not 'cold' - they are the perfect insulators in fact. In space the only way to lose heat is through electromagnetic radiation (i.e., infrared). The 3K temperature of space refers to this inherent background radiation that exists everywhere.
If you wore a tinfoil suit in outer space and that was ALL, you would be quite warm!
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Thank you! Vacuums are not 'cold' - they are the perfect insulators in fact. In space the only way to lose heat is through electromagnetic radiation (i.e., infrared). The 3K temperature of space refers to this inherent background radiation that exists everywhere. If you wore a tinfoil suit in outer space and that was ALL, you would be quite warm!