All fields and potentials in space have energy. The gravitational field and potential are no exceptions. Such energy is a ‘super-liquid’ having a non-particulate continuous distri- bution. It is not quantised. Field energy is thus defined as ‘dark matter’. Any ‘dark’ matter has gravitational mass density proportional to energy density according to E = mc2 . But dark matter has low inertia. Its inertial mass is deduced to be < 1/(2π)2 =∼ 1/40 of its gravitational mass. The gravitational potentials from any two or more objects combine at any point according to newly discovered RSS (Root-Sum-of-the-Squares) ‘process capture’ rules. This means that the stronger potential partially ‘suppresses’ the weaker potential. The weaker energy is thus partially suppressed and becomes ‘excluded’ in the region of stronger energy density from a dom- inant source. Total energy is reduced and gravitational attraction is thereby created. The ‘lost’ energy increases according to the inverse square law of two sources. This is the source of gravita- tional attraction of sources and masses. The gravitational field of a light particle terminates at a finite distance when it drops below the Zero-Point-Energy density of free space. These rules can be shown to apply both to gravity and to electromagnetic energy of any spectral distribution. Gravity and Electromagnetism thus become ‘unified’.