Law of gravitation and Newton’s third law of motion

According to Newton's law of gravitation, every two objects attract each other with equal force but in opposite direction. This statement is in accordance with the Newton's third law of motion.

EXPLANATION:

If $F_{12}$ is considered as “Action Force” and $F_{21}$ as “Reaction Force”. Then, it is concluded that “Action equals to reaction but in opposite direction”.

$\boxed{F_{12}=-F_{21}}$

EXAMPLE:

According to Newton's law of Universal gravitation the Earth pulls the Moon with its gravity and in reaction Moon also pulls the Earth with its gravity. Therefore they form an action-reaction pair, which is in accordance with Newton's third law of motion.