Most of the matter in the universe remains missing in action—at least, that's long been the standard cosmological paradigm.
Now, however, a small but vocal group of cosmologists is challenging the dark matter tenets of the widely accepted cosmological model, which holds that the universe is composed of roughly 70 percent dark energy, 25 percent dark matter, and only 5 percent normal (or baryonic) matter. Dark matter, whatever it is, exerts a gravitational pull but only interacts with ordinary matter very weakly, if at all, beyond that. Light seems to have no effect on dark matter—hence its name.
"Another stupid article in my opinion. Dark matter is easily understood as the gravity effect of virtual fermion-antifermion pairs inside the vacuum." -- Jack Sarfatti