Energy-Mass Gravity: Universe's Gravitational Pull

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zepp0814
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Hi I was wondering if there is an equation for finding the gravitational pull on on all object in the universe (including that's that are massless)
 
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i am aware of this already but i want to know does a is there a existing method to covert these to the unit Newtons
 
and also in the equation that was in the wiki, how is the Mass-Energy density expressed in the equation