Think of it like this. The speed of light defines the universe at its largest spans. It is reality’s speed limit: you cannot travel faster than the speed of light, and so you cannot transmit information beyond its reach. In other words: it cannot be exceeded. Planck’s constant, on the other hand, helps define the lower boundaries of reality by describing the smallest action possible for elementary particles. It cannot be subceeded. If the speed of light rules supreme among galaxies, black holes, and the spaces between stars, then Planck’s constant has for its domain atoms, electrons, and the
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