(1) The weight of a body of mass m on the surface of a planet of mass M and radius R is W = \(\frac{GmM}{R^2}\) usuai notation).
(2) For a given body, its mass is constant. G is the universal constant of gravitation. Different planets have different masses and radii such that the ratio (M/R2) is not the same. Hence, the weight of a body is different on different planets.
