Same thing as what I was saying. At the speed at which they are currently rotating, they should fly apart because there does not appear to be enough mass there to provide the gravity needed to keep them in orbit. Something unknown (presumably, gravity but now that is not so certain) is holding them together. Hence the theory that there is dark matter.
The galaxies wouldn't actually "fly apart" though. The stars in the galaxies would still orbit the supermassive black hole at the core of each galaxy. The problem is in the speeds of the orbits. Starts further out orbit faster than they would be expected to if the only mass they were orbiting was the visible mass. Hence the need for some kind of matter that exerts a gravitational force but cannot be detected optically, that is, "dark matter".
True, and I'm surprised they could day this so early on in the experiments. But that's what the propeller head boys are saying. Maybe the article is wrong or misleading. However Hawking himself has responded so there must be something to it.
The LHC hasn't even been run at full power yet. It won't be til 2014 according to the current timeline. From then, it will take 2-3 more years til enough data is in. I wouldn't expect an answer anywhere close to "definitive" on the existence of the Higgs Boson until 2017 at the earliest. The range has been narrowed, true, but the LHC was built to collide 7 TeV/nucleon beams for a reason, and has so far only used collision energies of 3.5 TeV/nucleon.
It's not a done deal but early indications are negative, and they know it's about statistics that there is no expected sharp cutoff between 3.5 TeV and 7 TeV.
I recall scientists say similar things in the late 1990's. We joked about it in our laboratory. "Scientists can all go home".
I agree, it would be exciting times. In the late 19th century, scientists believed physics was all but "done". Just a few "minor problems" were left to solved, like the derivation of the black body spectrum. When that didn't pan out, we saw the emergence of the revolutionary fields of relativity and quantum mechanics, which led to previously unforeseeable technological advances. The same happening again in the 21st century would be very interesting indeed.