Also, this is going on what I've heard over the years so some of it may not be true.
Super cold atoms behave rather strangely to say the least. Feats such as levitation (superconductors) and stuff like what was posted today (Feat of experimental acrobatics leads to first synthesis of ultracold molecules) have me wondering...
There is essentially a lot of dark matter in space. This dark matter is basically matter that is either so massive that light/detectable energy won't penetrate through it, or so sparse that it can't be detected (by any known means).
Is it possible that this dark energy is really just a result of super-cooled (dark) matter that in effect isn't affected by, or possibly repels other (warmer) matter?
For some reason, I keep thinking back to that old clip of the little tablet levitating over a super cooled disc, with someone making the tablet spin by tapping it with a pencil tip... the only reason it stopped spinning was because it wasn't in a vacuum, and the only reason it eventually dropped was because the disk reached a certain temperature.
Again, I'm no expert in this arena, but wanted to post the thought.