I watched a video by Dr. Michio Kaku, in which he states a theory about Dark Matter.
This theory says that Dark Matter could be just ordinary matter from another parallel universe, which would be right above us. Gravity, being a warp in space, could function across different universes. The way Dr. Kaku described this was by representing our 3 Space-Dimensional universe by a 2D plain (a sheet of paper), and placing a second sheet of paper above, representing a second universe. Light cannot travel between these two universes, but gravity can. Simply because if the warp of space is big enough, it'll reach our universe, and create a warp there as well. That's exactly what dark matter is, he says. A substance which we cannot see (Because light doesn't travel between universes) but has a gravitational field (because of the space warp.) Now if that is true, and a galaxy from the other universe comes and hovers right above our galaxy, there would be a gigantic mass of dark matter. We say that when the Andromeda galaxy reaches us, the gravity around the solar system will fling us out of the milky way. If a galaxy sized blob of dark matter zooms crosses paths with the milky way, is there a chance we'd be flung out of the galaxy? It makes sense, but I just want to make sure this is correct.