PBS Space Time asks: How do we study nothing?

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It turns out that “nothing” is one of the most interesting somethings in all of physics.

An empty jar still contains something: molecules of air and a bath of infrared light from its warm environment. But what if we suck out every last molecule of air, chill the jar to absolute zero, and shield it from all external radiation? The jar would contain only empty space, but it turns out that empty space is far from nothing.