Word: macrocosmic
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...first four constants are fundamental to Quantum Mechanics, which deals with the microcosm of the atom. The last two are fundamental to four-dimensional spacetime, which deals with the macrocosm of the universe. The velocity of light, c, is fundamental to both. According to Eddington, c is the natural "grain" of world structure. It is the velocity which cannot be surpassed, the speed at which masses become infinite, clocks stop, measuring rods contract to zero...