Two hypotheses stand out in describing the evolution of the Universe. The predominant one predicts that the current expansion began at a certain instant and will not preserve any variation of energy that performs work; apparent flat Universe (Ω=1) is advocated by relativistic calculations and observational data, with an end or thermal death at its maximum expansion (3D Space). The other hypothesis considers that the Universe is cyclical (always alternating phases of expansion and contraction). This proposal aims to demonstrate that both hypotheses can be correct by not being distinct, but complementary. Supported by the immutability of physical laws, analyses of concepts define an exclusive presence of 1D Space in static states of minimum and maximum expansion of the Universe. With our 3D Space Universe created and existing between these extreme states, the Friedmann-Lemaître-Robertson-Walker (FLRW) metric, despite its general effectiveness, becomes inadequate for analysis; therefore, the concept of absolute rest energy (1D Space) is applied, demonstrating that the complete evolution of the Universe is spatially dynamic in a perpetual time dimension, always recreating our universe, and making possible a relative maintenance of any existence.