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HHC
Backstop
MASS (or energy density) is the name we give to the property of matter which causes curvature of space-time,
Gravity is the name we give to accelerations dependent on a bodies mass (or energy density).
Which is somewhat semantics but ultimately mass/energy tells space how to warp and space tells mass/energy how to move.
Technical addon:
[G=(8*pi*g)*T], where G is space time curvature and T is energy density, the rest just constants.