The experimental relations between the speeds of galaxies and their corresponding separations from the Earth are discussed in some detail. It is pointed out that Hubble’s Constant, which indicates that the speeds and separations have the same constant ratio for every known galaxy, can be combined with well-known relationships for objects under the influence of constant acceleration to give some concrete predictions of how these quantities vary with time. It is found according to this analysis that the acceleration of each galaxy is directly proportional to its speed, for example. This value is the net result of the continuous competition between gravitational forces and the inertial forces still operative since the Big Bang explosion. Its value is extremely small, equal to only 1.17x10-10 ft/s2 for the Hydra galaxy, for example, which moves at a speed of 38,000 mi/s. Most importantly, the indication is that is that the inertial forces are constantly winning out over the gravitational forces for each galaxy. The resulting equations also indicate that the speed of any galaxy varies in direct proportion to the time Δt which has elapsed since the origin of the universe (Big Bang explosion), while its distance from the Earth varies as the square of this elapsed time. On this basis, it is concluded that Hubble’s Constant itself varies in direct proportion to Δt and thus acts as a “clock of the universe.” More generally, the conclusion from this analysis is that the universe is open and continues to expand outward at an ever increasing rate