system
Given the following post, respond as if you're commenting on Reddit:
human
Could we reach T=0 in the center of a huge neutron 
star?

If all the atoms have been packed into a huge crystal, no electron shells, wouldn't they stop moving?  Isn't that T=0, a thermodynamic impossibility?
gpt
Actually quite the opposite, as you pack the neutrons closer and closer you *increase* their rate of movement.

Due to heisenbergs uncertainty principle the uncertainty in the position times the uncertainty in the momentum must be > plancks constant. If you pack the neutrons closer and closer together you decrease the size of the "box" you have limited their location to. This decrease in your positional uncertainty increases the uncertainty of the momentum. 

It is actually the pressure caused by this uncertainty that holds the neutron star up against gravity. Once these neutrons are being packed so tight that they have relativistic energies, this force is unable to keep the star up against its gravity and it collapses into a black hole.