In order to explain the physical nature of motion and of gravity and their effects, wemust ascribe physical qualities to Cosmic space. Space is a substance: the seat of gravity, inertia, electromagnetism and particle formation. The author asserts that space has many of the qualities imputed to it by Newton, Maxwell, and Lorentz, but that gravity is caused by matter’sconsumption of space. Space appears to be a massless, frictionless quantized fluid. It accelerates as it flows centripetally into all matter at GM/r^2, explaining gravity’s ballistic effects. Its velocity at any given height is sqrt (2GM/r) , explaining gravity’s electromagnetic (relativistic) effects including the gravitational redshift and black holes. This flow of gravitoinertial-electromagnetic space is the physical reality underlying the successes of Newtonian Mechanics and General Relativity. The theory is philosophically superior to existing models: it explains, simplifies and unifies the phenomena; and makes additional predictions.