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It acts on every object that has mass; not only on point masses.

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It is wrong to saw that gravitational force only acts on point masses

but the formula by newton is only valid for point masses, solid spheres,hollow spheres

according to newtons laws of gravitation

which is

because as the center of masses changes with irregular body so we cannot take the distance between the two particles from their center

but to take out the gravitational forces of irregular surfaces we will nee the center or mass which we can take out by calculations then we have to use calculus to take out gravitational force from an elemental level

but the formula by newton is only valid for point masses, solid spheres,hollow spheres

according to newtons laws of gravitation

which is

because as the center of masses changes with irregular body so we cannot take the distance between the two particles from their center

but to take out the gravitational forces of irregular surfaces we will nee the center or mass which we can take out by calculations then we have to use calculus to take out gravitational force from an elemental level