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Newton’s universal law of gravitation:
This law states that every particle of matter in this universe attracts every other particle with force.
The force between the particles is always attractive, and it does not depend on the medium where they are placed.
Let m1 and m2 be the masses of two bodies \(A\) and \(B\), placed \(r metre\) apart in space.
The gravitational force between two masses
This force of attraction is directly proportional to the multiplication of their masses (m1 and m2) and inversely proportionate to the square of the distance between the centres (r2) of these masses. This force acts in the direction along the line connecting the masses.
Force (F)m1×m2 F 1r2 
On combining the above two expressions,
Force (F)m1×m2r2Force (F)=G×m1×m2r2
\(G\) is the universal gravitational constant
The SI unit of universal gravitational constant is Nm2kg2, and its value is 6.674×1011Nm2kg2.