Without additional bulk, the gravitational force could not prevent stars from being flung off on a tangent as their host galaxy rotates.

So just as the moon's gravitational force produces tides in the sea, it produces biological tides in the human body which can affect the brain.

It is noticeable at parties that, far from being shunned, those carefree souls who light up invariably become a gravitational force.

Something must be causing it, exerting some gravitational force as yet unexplained.

But those masses also exert gravitational force upon each other.