Consider that as these mobile organisms, this sentient interface our body has with its situation functions as a sequence of perceptions, in order to navigate, so it is our experience that time flows from past to future.

The evident reality is that activity and the resulting change turns future to past. Tomorrow becomes yesterday, because the earth turns. Pontential>actual>residual.

There is no physical dimension of time, because the past is consumed by the present, to inform and drive it. Causality and conservation of energy. Cause becomes effect.

Energy is "conserved," because it manifests this presence, creating time, temperature, pressure, color and sound. Frequencies and amplitudes, rates and degrees. Touch a hot stove and say heat is imaginary.

So the energy goes past to future, because the patterns generated come and go, future to past. Energy drives the wave, the fluctuations rise and fall.

Different clocks can run at different rates, simply because they are separate actions. Think metabolism.

Human culture synchronizes behavior, using the same languages, rules, measures, etc, so it might seem like there should be one universal time, but that would be like only one frequency. It's rabbit time and turtle time and the turtle is still plodding along, long after the rabbit has died.

Consciousness also goes past to future, while the perceptions, emotions and thoughts giving it form and structure go future to past. Suggesting consciousness manifests as a form of energy, though it is the digestive system processing the energy and feeding the flame, while the nervous system sorts the information, signals from the noise, while the circulation system is feedback in the middle.

While it might seem that our nervous systems are constantly selecting the most advantageous signals, the more fundamental factor is that they select those that most readily synchronize with our prior models and beliefs, thus creating mutually supporting feedback loops, that also have us bonding to those on similar wavelengths.

Which would explain the herd behavior of large numbers of individuals, of all species, where they function as one super-organism.

Given that energy goes to the future, as patterns recede into the past, it should also be noted that with galaxies, the light radiates out, as structure coalesces in. So while entropy for the light/energy is to radiate toward infinity, the entropy for the structure is to collapse toward equilibrium.

Apparently because synchronization is more efficient.

Given that what actually falls into black holes is shot out the poles as quasars, which are like giant lasers and lasers are synchronized light waves, it might be a useful model.

Then all that excess gravity would be due to mass being an intermediate effect of this centripetal dynamic, going from the barest bending of the light, to the black holes, rather than gravity as a property of mass. Therefore eliminating the need for Dark Matter to explain it.