The quietest thing, or the quietest place, theoretically, is in a perfect vacuum. But since there’s no such thing, no place in the universe that is completely devoid of cosmic
While scrolling through the various press releases that come my way, I was struck by one describing research taking place at Rice University in Houston and Kyoto University in Japan, where scientists now have manufactured the coldest particles in the universe — so cold that we don’t even have tools to measure them.
With the article, as was the case with my academic studies, “the dramatic and the theoretical” is about where my interest ended, but still, my curiosity was piqued regarding extremes. I wondered, if that’s the coldest particle, what’s the hottest? Just as there’s a theoretical absolute on the cold side of things, likewise there’s an absolute hot too; it’s called The Planck temperature, and it’s 100 million million million million million degrees.
The actual “sound” of these waves corresponds to a B-flat, 57 octaves below middle-C, which means the frequency is so low and so slow — and the distance between crests of the waves is so spread out — that it takes roughly 10 million years for a single wave to pass by.
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