[ELI5] Would something stay hot in the space forever since there is nothing to transfer its heat?
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Accelerating charges radiate electromagnetic waves. If you have some material that is made of atoms above 0K they are oscillating. Thats what we call temperature. And the occilation is called thermal motion. Now we got charges that are always accelerating back and forth. They radiate. Thats what we call thermal radiation.
This energy comes from the motion of charges so they behave like lightly dampened oscillators. They emmit light and slow down.
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