The First Edition of this title presented a method to study the structure of matter with a full Example analyzing string, photon and graviton. In this Second Edition we take that Example as a theory which offer volume, weight and length of a string and equate strings with photon and graviton, and prove that strings have two properties: affinity and a state of stillness or vibration. Offers too, the quantity of photons in a stream of light and how to compute radiation with them. Gradation of physical laws from the event horizon up to the macro scale is developed in detail never made before under a Universe in expansion. Proof that light cannot reach the full expand of the Cosmos is computed, and in the volume far away from the observable expansion are found the dark matter and its carried energy. Many new formulas are found, especially E = D.V in addition of Planck and Einstein E's; Newton constant of gravitation for that part of the Universe beyond the observable is equal to h times c squared. Additions to the First Law of Classical Mechanics and Second Principle of Thermodynamics are suggested. From the First Edition are maintained the Introduction to Modeling Structure of Matter and on Extractable Energy, more research are required in the former and experimentation in the latter. It appears that at micro scale the structure of matter can be properly modeled and at large scale the Cosmos is larger that it is assumed, its more accurate size is computed as well.