Does everything have gravity?
the most accurate model we have of gravity is General Relativity which says gravity is embodied by the shape of space time—-“gravity is geometry”. The main equation is the 1916 so-called Einstein equation which says curvature = (8pi G/c4) energy density the expressions for the energy density and curvature are complicated but in answer to your question yes, all forms of energy are at least nominally included—–very tiny contributions can be neglected as in all physics. But the mass-energy in matter and the light-energy in light and the so-called dark energy which is inferred but not explained and even heat energy—-all these things contribute to curving space-time through the total energy density on the RHS of the equation and all stuff follows the curvature—even light does not go in straight lines but is bent by the curvature of space. Planets go in their orbits because of the curvature. What feels like the force of your weight is the effect of geometry. It just happens that thi
