sir gravitational force produces accelaration in objects and according to theory of relativity no one can move faster than light so their should be a limit of maxi. density of a mass m because densitydetermines the distance between the objects. but i think whatever be the density of object the another object which is very very far from the first object can attain the maximum velocity if product of their mass isvery large.how can this be explained?

Dear student,

This is self explanatory and need no further proof. 

The another object which is very very far from the first object can attain the maximum velocity if product of their mass isvery large.

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