Amnion: "..dark side of the moon, or in deep space. These places are always very cold, which is a good start.."

I think you'd be surprised how warm (in a relative sense) these places are. If you put a thermometer is deep space and allowed it to cool (this would take a really long time), and kept it isolated from all sources of light and background radiation, you'd find it would never read cooler than 2.7K.

The first Bose-Einstein Condensate (1995) had a temperature less than 100 billionths of a degree above absolute zero (100 billionths of a degree kelvin) i.e. a lot colder than outer-space!

Thanks,
D.