Abstract: A review of the traditional possible causes of cosmic redshift —namely Doppler, expanding vacuum, gravitational, and tired light— is presented along with a discussion of why they failed. A new cosmic redshift mechanism is constructed based on a non-mass, non-energy, space medium (which serves as the luminiferous substrate) and the DSSU cellular cosmology (a remarkably natural problem-free cosmology). The cosmic redshift is shown to be a velocity-differential effect caused by a flow differential of the space medium. Furthermore, the velocity-differential redshift/effect is shown to be part of a much broader unification, since the very mechanism that causes the gravitation effect and sustains the Universe’s gravity-cell structure is also the mechanism that causes the λ elongation manifesting as the cosmic redshift. Agreement with the verifiable portion of the redshift-distance graph (z ≤ 5) is outstanding. The main point is that intrinsic spectral shift occurs with a transit across/through any gravity well (sink). It is caused by the difference in propagation velocity between the axial ends of the photon or wave packet. Which, in turn, is caused by the difference in velocity of the aether flow, the flow differential of the aether, that occurs throughout a gravity well. And here the causal chain is linked to gravity: the change in velocity of the aether flow is what produces the effect of gravitation. The acceleration of the aether flow is the manifestation of gravity.Abstract: A review of the traditional possible causes of cosmic redshift —namely Doppler, expanding vacuum, gravitational, and tired light— is presented along with a discussion of why they failed. A new cosmic redshift mechanism is constructed based on a non-mass, non-energy, space medium (which serves as the luminiferous substrate) and the DSSU cellular cos...Show More