| According to current observations, two mysterious phenomena appear in the universe that science has not yet explained. These are mass or dark matter and dark energy. It is known of the existence of dark matter, among other effects, by the study of the rotation of galaxies where it is appreciated that the outer stars should come out tangentially if only the gravitational force of the mass seen is considered, concluding that there must be a hidden mass or matter, or perhaps some unknown effect that implies greater gravitational force |