Works on quantum mechanics (astronomy, cosmology etc.) often mention that the laws of quantum mechanics don’t apply in the macro world. It all depends on what you mean by macro world. How many atoms constitute the limit, just a couple of them, or a glass of milk, a sizeable house, a city, a continent? Instead, let’s dream big, the whole Planet, maybe our Solar system, our Galaxy, or the Universe as we know it. In this book, we don’t mean to extend quantum mechanics. As physical models go: given a world view we find the boundary conditions, set up a mathematical model corresponding to it, and compare it to the reality. Instead of the extension of quantum mechanics we simply take it as it is. Let’s examine what kinds of systems correspond to their laws and under which conditions. The fundamental statements underlying the book are the following: In Solar System-like structures, the individual constituents possess some charge (besides having mass, spin, magnetic moment, just like the particles of atomic structures). This statement allows for the quantum-mechanical modelling and interpretation of Solar System-like structures. All else can be derived from the above statement. The gravitational field and electric field exist independently of each other. The validity of the basic relationships between relativistic quantum mechanics is true for atomic scale systems, as well as for galactic scale systems.