Thanks for the link. Interesting, but a bit too mathematical. Maybe in time you will explain more in words. Nevertheless, very interesting indeed.

Back to my question: From your Equation 21, it follows that the relativistic mass: m=sqrt((m0*c)^2+(p)^2) = gamma*m0*c^2 and not the rest mass m0, should be used in |F| = G*M*m? / r^2;.

Do I understand this correctly? Could you confirm it?

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If so, it means that the relative speed between objects determine how much gravitational attraction there is. Is that right?