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It is argued that the quadruple gravitational constant 4G can be seen as afundamental limit of nature. The limit holds across all gravitational systemsand distinguishes bound from unbound systems. Including the maximum forcec^4/4G allows extending the Bronshtein cube of physical theories to a cube oflimits. Every theory of physics refining Galilean physics - universalgravitation, special relativity, general relativity, quantum theory and quantumfield theory - is defined by one fundamental limit. As a result, alsorelativistic quantum gravity is defined by a limit: the minimum length innature. The minimum length is used to deduce the Planck-scale structure ofspace. Numerous options are eliminated. Then, the minimum length is used todeduce the main properties of the common constituents that make up space andparticles.

From the Bronshtein cube of limits to the degrees of freedom of relativistic quantum gravity