My views are derived from my current work-in-progress Unifying Theory-Creation By Collision, which attempts to explain perceived "energy" by means of the motion dynamics of matter.
Good answer Pat, but what are we really measuring when we measure temperature? Energy?
My naive thoughts tell me that if we make motion the absolute, and we build a framework which is trying to equalize its matter in motion, degrees of temperature takes on the roll of spatial degrees of freedom of the fundamental material building blocks, and thermodynamics become spatialdynamics, whereby the potiential for motion (temperature difference) between two massive bodies is equivalent to the spatial to particle ratio/density between them.
Absolute zero then becomes massive formations of matter which contain only Planck volumes of space, and an absolutely hot system is a symmetrical arrangement of all of its matter, whereby the max amount of motion potential is possible.
In a closed universal system, the total motion potential (total temperature/energy) would then be equivalent to the total volume of unoccupied space, thus conserving it, as it also is now finite and absolute, along with the matter and motion within it.
Have you ever heard of the kenetic theory of gases?
If so, the theory implies that the molecules of a gas are like billiard balls and they create pressure on a container as they collide with it and each other trying to equalize the energy which they contain, due to a differential in temperature/heat.
It implies that their individual velocities are relative to the energy each ball contains, thus the individual collisions take place with more/less force, as the total volume of gas attempts to transfer its energy from ball to ball, thus equalizing the total volume, whereby all collisions take place with the same force.
Our universal system could be somewhat viewed as a kenetic theory of everything, made up of fundamental billiard balls, but rather than different degrees of velocity which is implied by the admittance of energy, the velocity of all of the balls, thus the entire system, is absolute and finite and the balls are actually trying to equalize the varying spatial densities between each ball. Rather than colliding with more/less force, some travel farther than others before impact.
Does this help in my explaination?
P.S. Measurements of time would also be finite and absolute within this system as they are governed by Planck degrees of motion. The total amount of time (elapsed motion) the system had to operate with would be the only infinite entity.
I like your logic. Perhaps, there is no natural means to create absolute zero due to the nature of temperature equating to spatial degrees of freedom. Due to the dynamics of the system, this would only naturally come close within the center of a hugely massive galactic formation/body. Believe it or not, in my opinion and by the definition of temperature that I hold to, the center of our sun contains the particles with the least amount of spatial freedom, thus its massive size, which implies that it contains the particles closest to absolute zero near its center. Doesn't that seem weird?
However, I don't think it's possible to reach absolute zero naturally, because by the time the formation has gotten massive enough to cause it within, near the center, the whole formation is unstable to the vast amount of motion potential without, in its surroundings. Thus we see the massive potential to effect the rest of the system, as is seen by a star such as our sun.