We have discussed, from the viewpoint of imaginary Venutian scientists, possible interpretations of gravity in terms of known fields. We assume that these scientists know the general properties of field theories; they are now searching for a field having the characteristics of gravity. In order to make distinctions between various possibilities, we shall need to recall the following properties of gravity; that large masses attract with a force proportional to the inertia, and to the inverse square of the distance; also that the mass and inertia represent the energy content, since the binding energies of atoms and nuclei have a gravitational behavior identical to the rest energies.