Temperature is relative.

The absolute zero point is -273,15 degrees Celsius. That thing is the minimum energy level in our universe. That means the temperature cannot go below this absolute zero kelvin degrees. Or we can say that temperature can go below that temperature outside the universe. 

But then we must realize one thing, the universe is the same time hot and cold. And the space outside the universe is much stranger than the universe itself. When the temperature reaches absolute zero point, that means that all movements end and helium turns to ice. So at that point, we have nothing that can measure lower temperatures. ''

The thing is that because the universe sends wave motion like IR-radiation away from it, that thing causes a situation in that the space outside the universe is at a lower energy level than the universe itself. When that thing happens universe loses its mass. That radiation is the result of the reaction where material turns to wave movement. 

Almost all material in the universe is in plasmatic mode. When gas or plasma is in very low pressure. Those atoms have a space, where they can jump around. And those jumping atoms cause a situation where they act like bullets. Those jumping ions are the reason why space pilots must have space suits that can protect them against those ions. 

But as I wrote earlier temperature is relative. The maximum temperature is 55 kelvin on that dwarf planet.  Depends on people if the temperature is low or high. Temperatures are relative things. And it would be crucial in many reactions. Especially in nanotechnology is needed ultra-stable conditions that atoms are connecting them to the wanted direction. 

One of the most interesting things in ultra-low temperatures is that the aging of cells stops. At the absolute zero point, where all movement ended. There is no vibration in DNA. That thing means. That the systems can store even the human body and DNA to an absolute zero point. And in some visions, those bodies will wake up centuries or even millenniums later. 

Theoretically, researchers can make interstellar journeys or even immortality possible. But the problem is that waking up that crew is not as easy as people think. The temperature must rise so slowly that the cells of those people will not split.  If somebody solves that problem theoretically is possible to create immortality that base is in this very low technology.