B What would happen to perception if temperatures almost reached absolute zero?

[lee_st]

Say there was something that made the temperature of the universe almost absolute zero, but around you was a mini bubble where the temperature was normal, and therefore molecules could move normally around you for a small area. How would you perceive the world around you outside of the little bubble of normalcy around you?
Furthermore, say another person was in the same situation as you. Would you be able to see them moving towards you, or would you not perceive them until they entered your bubble?

 

[PeroK]

Electromagnetic radiation propagates through a vacuum. It doesn't need a medium at all.

Here's something useful perhaps about the temperature of the vacuum:

https://van.physics.illinois.edu/ask/listing/1046

 

[vanhees71]

It's a bit misleading to call a region of space, where there is electromagnetic radiation in "vacuum". Also one should note that a many-body system having a temperature $T=0$ doesn't need to be a vacuum. It's just that this medium is in its lowest possible energy state.