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The lack of a vacuum affects gravitational force. An easy example of this is the resistance a sky diver feels from the atmosphere, limiting them to a speed (terminal velocity) of 170 km/h. So in vacuum gravitational force is maximised.
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Gravity is the curvature of space. That curvature is caused by the presence of matter. Vacuum is space that contains no matter. Therefore vacuum has no impact on gravity and gravity has no impact on vacuum.
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No, b/c gravitational constant G is universal constant.

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