> I think Laser cooling would be much more practical, temperatures about that
> low have already been reached with it, it's how a Bose Einstein condensate
> was made a few years ago.
The problem is that the lasers themselves get hot. It is a very
energy-intensive form of cooling, and you cannot fool entropy with
it. So it will likely work well for small regions, but an even larger
region will get entropic.
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