In some sense, gravity does not exist; what moves the planets and the stars is the distortion of space and time.
Michio KakuHowever, one new theory says that dark matter may be ordinary matter in a parallel universe. If a galaxy is hovering above in another dimension, we would not be able to see it. It would be invisible, yet we would feel its gravity. Hence, it might explain dark matter.
Michio KakuThey basically ask their engineers to volunteer some probability figures, then they take the average. This is not science. This is voodoo.
Michio KakuThe next big accelerator might be the ILC in Japan, a linear collider which might be able to probe the boundaries of string theory. So we physicists have to learn how to engage the public so that taxpayers money is used to explore the nature of the universe.
Michio Kaku