[ELI5] Would something stay hot in the space forever since there is nothing to transfer its heat?
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Ever seen a white hot piece of iron? Even in absence of conduction and convection, that radiation of light still transfers heat away. And nothing ever really stops glowing that way, it’s just that as the temperature goes down the light emitted gets redder and we can’t really see infrared with our eyes. With a thermal camera you can however.
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