Horizon tonight on the BBC, covered the mysteries of cosmology, dark matter, and dark energy, which make up much more of the universe, the conventional 'baryonic' matter we know about. It ended though with a final mystery dark flow, one a rushing of galaxy clusters at the largest scale of the universe, toward some mystery attractors, which might well be outside the now visible universe. The potential explanation, this was caused by the attraction between the then small density fluctations, just before inflation expanded the universe at a speed faster than light.
All very well presented, if a bit over the top on distracting music and big bang shaped special effects. Dark Flow however is very iffy as a real physically effect, see papers like Kiesler, who disputed the significance of the statistics, but, Edge et al which hold the effect to be real. We find out in time, once the Planck space telescope data come in, (a space telescope, with 10 times the current resolution for the cosmic background radiation), and we more detailed measurement of galaxy clusters.
Horizon, begun its episode with everything you know about the universe is wrong. But then told the usually story of dark matter and dark energy, which mainstream cosmology currently believes true. I have my own theory, of dark energy as caused by an fifth force between neutrino, which unfortunately did survive my first publication attempt. But in the next post, I attend to show why the evidence is starting to look bleak for the super-symmetric theory of dark matter.