In addition to the other answers, I would like to note that 0°C being where it is is ultimately arbitrary. Make no mistake, there were valid reasons to set it there, but it was still a decision made by people, rather than anything meaningful on a cosmic scale.
If we were to use a temperature scale with the 0 point at the temperature of a main sequence star, then absolute zero would be close to -5000°, and probably wouldn’t look so small.
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