So, we all know whether a train is moving depends on where the observer is. For passengers riding on it, the train is not moving. And high temperature are just particle moving with high speed. Is it possible that some observers will find a hot object cold? Just like the passengers on the train Thanks in advance!
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A current, still untested but widely believed theory, would make temperature “relative” as well: [Unruh effect](https://en.wikipedia.org/wiki/Unruh_effect ). And it’s related to the more well-known [Hawking radiation](https://en.wikipedia.org/wiki/Hawking_radiation ) which has the same mechanism according to general relativity. This is very much an extreme example: the **vacuum** itself is seen as hot and steaming with particles.
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