It's not easy getting used to the fact that there are more than just the four forces of physics we've learned about since we've skipped the class assignment to read about them. The Virtual Force Theory gives the four forces the nomenclature "general forces" and, also, considers Dark Matter and Dark Energy as two "special forces". The Virtual Force is the result of the cumulative mass-energy of the virtual particles that pop in and out of existence throughout quantum, cosmological and infinite space and manifests as the six forces of physics, the four general forces and the two special forces. How the Virtual Force manifests, i.e., as gravity or Dark Matter, is dependent upon how the globs of mass-energy are arranged in a particular circumstance. The Virtual Force Theory, as are the theories of Dark Matter, Dark Energy and the theories of the general forces of physics, is based upon inference, supposition and speculation (and some observation of reality).