The force of gravity is inversely proportional to the square
of the distance between the centers of the two objects that
experience the forces.
On the Earth's surface, we are 1 Earth radius from its center.
At 3 Earth radii from its center, the forces of gravity are
1 / (3²) = 1/9 (about 11%) as strong as they are on the surface.
The weight of the 0.6 kg mass is (mass) x (gravity) .
Weight = (0.6 kg) x (9.8 m/s²) x (1/9)
Weight = 0.653 Newton (about 2.35 ounces)
