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Newton’s law of gravitation states that the gravitational force between two point masses of magnitudes and is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.
The directions of the planets change as they orbit at a constant speed, therefore they accelerate and this implies there is a resultant force acting on them (gravitational pull towards the star), thus, the planets are not in equilibrium.
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between two point masses of magnitudes 
and 
is directly proportional to the product of their masses and inversely proportional to the square of the distance 
between their centres.
