The contemporary physical theories are based on several fundamental physical constants. No theoretical framework provides their experimental values. Here, we might have found two formulas yielding the speed of light and the Planck constant according to the vacuum properties and fundamental constants. In particular, they highly suggest that gravitational and electromagnetic waves must actually propagate in matter. Because there is no dense matter between high-mass bodies in the universe, the relations would mean that the structure of the universe is at least pentadimensional (four spatial and one temporal dimensions). We then discuss the implications of this hypothetical feature on contemporary physics.