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I agree with kutulu about that. If you wanted to increase the gravitational pull of that point mass, you'd add more mass to it. Whether the volume (and therefore, the density) changes, is totally irrelevant. Realistically, if you increase the mass of the point mass and bring a varying volume into the equation then its density is going to change. However, the mass and the distance from the object are the only two factors you need to worry about when calculating gravitational effects. Volumes and densities are a completely different story.
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