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I was wondering whether the actual cause of gravity is understood.
I do know that the greater an object's mass is the greater the gravity it exerts on other objects.
I was wondering whether the gravity is not just a residual effect of the nuclear forces.
For example if it takes 99 units to hold an atom together but the nuclear force is 100 then that leaves 1 unit which can create an attractive force outside an atom.
It has occurred to me that gravity might be a tiny imbalance of much stronger equal and opposite the forces within massive particles. Perhaps the imbalance is caused by the expansion of space.