Gravity is explained as a tired light recycling effect maintaining the structure of matter. It is consistent with both relativity theory and Quantum Electrodynamics. With a particular value of the Hubble Constant, the density of mass in the universe equates to nuclear density, as with the ratio of gravitational force to electromagnetic force between the proton and electron equaling the ratio of mass densities between that of the average density of the universe and the nuclear density of the hydrogen atom. The book development is consistent with the historical development of theory, which is provided in the book for more complete understanding along with explaining math according to simple algebra.