  In this paper, the Wheeler-DeWitt (WDW) equation is derived in null-foliated
4D spacetimes. WDW equation written in null-foliated spacetime presents an
enormous simplification compared to the spacelike-foliated spacetime as the
null-foliations are 2D. These can be solved exactly and uniquely to give the
vertex operators of non-critical strings as a solution. A correspondence is
established between null surfaces in 4D to string worldsheet geometry. Attempts
are made to derive the physical consequences of this correspondence.
