In this paper, we will present a new perspective of certain dimensions that manifest physically and therefore can be studied. Theoretical ground work will be set within General Relativity since it provides the highest accuracy in cosmology, but we will also “bridge” to quantum mechanics near the end of the paper. Using the notion of “physical dimensions” we will explain some aspects that have puzzled physicists so far, including what is known as “the arrow of time”. It will be proven theoretically that there is no such thing and that time has no direction since temporal motion requires only expansion and a velocity of that expansion, time expands in all directions and influences the expansion of space, hence inflating space and forming the spacetime continuum from the earliest age of the Universe, the Big Bang, to present time.