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>....I find myself disappointed for missing an opportunity
>for a little exploration at a junior high level -
When it comes to the ability of an object to produce a spacetime
curvature (i.e. a real gravitational field) the relevant property
of the object is not its mass, per se, but the components of its
4x4 stress-energy-momentum tensor. These components are the energy
density (the time-time component), the stress (including the
pressure, shear & anisotropic compression/tension, the space-space
components), and the momentum density (or energy current density,
the time-space components).