While most of the world measures temperatures in Celsius and the United States clings to Fahrenheit as if its hands were frozen, scientists usually prefer Kelvin. A degree Kelvin marks the same difference in temperature as a degree Celsius, but the starting point is 273.15 degrees lower. If you think that sounds like an odd number, it’s used because that puts 0 Kelvin at absolute zero, the point where there is no heat at all. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Yet nothing in the universe, neither the cold of outer space nor anything humans have produced, is at absolute zero. Unless there is something substantially wrong without our understanding of physics, nothing ever will be 0 K either, although we have achieved temper

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