Recently I heard a talk by Bill Phillips, who talked about the coldest temperatures in the universe.
Among others, he sayed that the coldest temperatures created at the moment are BECs, which can reach roughly 300 pK. Furthermore he mentioned, that in the future it might be possible to create BECs in space at a satellite, where one could reach up to 1 pK.
I don't understand why a BEC in space would be so much colder. The low pressure and temperature in space cannot be the reason I think, because this is not the case in a satellite (electronics etc. would not work otherwise). The only other thing that is different is that such BECs are in a free-falling environment. But I don's see how one could get a factor of 300 in temperature, given that the BEC on earth is anyway trapped, and gravity is very weak.
Does anybody know an explanation or a reference for such a statement?