sentences: the gravitational force of a planet does not change the mass of an object on that planet or celestial body
docs: objects_with_mass is gravitationally. gravity is force_in_universe. gravitational_mass is mass. everything has own_gravitational_force gravitational_force_function is function. planet is celestial_body. gravitational_force_vector is body_force_vector. gravitational_force_function is force_function.