It's damn cold!!!!!
Space is at 2.7K above absolute zero.
The temp' can't be reached...just as no physical object can travel at the speed of light. If it did, there'd be a cascade effect where everything surrounding that spot at "AZ" would very quickly cool till it reached equilibrium with that spot. Once that happened and the whole universe was at "AZ", no energy would be present, not even quantum zero point fluctuations. It would, in effect, be violating every known law of physics if it occurred.
For instance, the entire universe would have no mass at all...weigh nothing...because the matter and such within it would have no interaction at all with the Higgs Field and no Higgs Bosons would form as a consequence of the interaction. No mass...no gravity.