English: This diagram describes the mechanisms of Newton's law of universal gravitation; A point mass m₁ attracts another point mass m₂ by a force F₂ pointing along the line intersecting both points. The force is proportional to the product of the two masses and inversely proportional to the square of the distance (r) between the point masses. Regardless of masses or distance, the magnitudes of the two forces, |F₁| and |F₂| (absolute values), will always be equal. G is the gravitational constant; G ≈ 6.67428(67)×10⁻¹¹ m³/(kg·s²).