I dunno noone, they think they've 'found' 12 universes (membranes they call them) in string theory, and it is possible to move between them.
Ordinarily I'd dismiss unproveable scientific theories as next to fairy tales, but they believe the reason gravity is so weak is because it moves freely between them, and so they are watching impacts in particle colliders, hoping to see a gravitron dissappear. So who knows. Neat, anyway.
Besides, I'd like to hit warp 9 someday
Pete