First of all it's not possible to achieve 0K according to the Third Law of Thermodynamics, which says that 0K will ONLY occur when all of the matter AND energy is randomly distributed across the universe. Which is basically saying it is impossible to achieve this state. "it is impossible to cool...
BEC's don't form at temperatures naturally like that. In order for a BEC to for you would need either a very unusual phenomenon or for human interaction. Space doesn't get cold enough to form a BEC, so therefore it wouldn't form anywhere in space naturally. Though in some quark stars, neutron...