Some physicists believe that it may be possible to show that all four forces (including gravity) are aspects of a single underlying force, and covered by a theory called the "Theory of Everything". Su...Some physicists believe that it may be possible to show that all four forces (including gravity) are aspects of a single underlying force, and covered by a theory called the "Theory of Everything". Such a theory (which is essentially a grand unified theory plus gravity) has not yet been found, nor is it known whether such a theory even exists.
