We take the postulate of Special Relativity, that the cosmic rules observable through physical phenomena, are the same for all stars in all galaxies. We have deliberately avoided using the phrase; “in all inertial frames of reference” to avoid conceptual mathematical debate in defining what such frames of references are [1-4]. Then, accepting the universal validity of light velocity defined by Maxwell’s wave equation, c2 = 1 / (ε 0μ 0) ; we revive the old ether concept with physically descriptive phrase that space is a continuous Complex Tension Field (CTF). This is strengthened by the fact that all non-dissipative tension fields allow for perpetual propagation of waves when excited within its linear restoration capability. We accommodate the particles as localized self-phase-looped resonant oscillations of the same CTF; thus integrating particles as another kind of excited states of the same CTF . Further, all tension fields allow co-propagation and cross-propagation of multiple waves (preservation of wave properties and the respective Poynting vectors) through the same physical volume (linear Superposition Principle) in the absence of perturbing resonant detectors within the volume of superposition. We have re-named this universal property of all waves as Non-Interaction of Waves [6,7]. Thus, Doppler shifted waves from different stars and galaxies can cross through each other unperturbed while bringing to us the signatures of the properties of their parent stars. Now, if these light signals are waving of CTF, the optical Doppler effects must also be, as for sound waves in air pressure tension field, discernable into two different frequency shifts: as due to (i) source velocity (distant stars) and (ii) detector velocity (that of the earth) [8,9]. In other words, we are proposing that CTF (modified old ether) is the stationary cosmic rest frame. Since we have been routinely assuming that quantum phenomena are same in all stars; we strengthen our position by analyzing the origin of absorption lines in distant stars as the same energy level transition phenomenon as we observe on earth and well-modeled by precision spectrometry and validated by QM formalism. The analysis also reveals that Cosmological (Hubble) Redshift cannot be due to optical Doppler Effect; since the Doppler Effect is determined by the velocities of the source-atoms within the star coronas. We have also proposed a satellite based one-way light propagation measurement; which could identify the absolute velocity of the satellite and validate that CTF is the stationary rest frame for our observable universe.