Was Newton's third law experimentally verified for gravitational forces, or was it extrapolated from other types of forces? – hsm.stackexchange.com

Newton's third law states that, for two material points 1 and 2, the forces they exert on each other satisfy $\bf{F}_{12}=-\bf{F}_{21}\,\,\, (1)$ and that the forces are parallel to the line ...