Hi,
The strength of the gravitational field between any two objects depends on the mass and seperation of the objects. It also depends on the pressure and energy of the objects. For example if you have two identical springs you can increase the gravitational field by compressing one of the springs. This causes energy to be added to the system (which is equivalent to mass) and so adds to the gravitational field.
Possibly spinning adds to the angular momentum of a system and so increases the amount of energy and so increases the gravitational field?
Cheers
Paul
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