Sorry, variable gravity or Modified Newtonian Dynamics (MOND) has been theorized before and it is gaining acceptance, but neither dark matter, energy or MOND has been observed yet.
I wasn't speaking of variable or anti gravity specifically, merely using it to describe what I was thinking. I am not quite sure if it would fall in MOND though, I'll have to look into that sometime. The kind of force I am talking about wouldn't be observable except at intergalactic distances.
Don't fret much though the Nobel Prize isn't what it used to be.
Yeah, I know what you mean, apparently making a movie can get you one. I wasn't all that serious anyway, it was more of a passing idea. I leave the serious contemplation to the guys with more than 2 semesters of physics.