Universal Gravitation
The gravitation law, or the universal law of attraction, elaborated by Isaac Newton at the end of the 17th century, describes gravitation as one and only force responsible for the fall of bodies and of the celestial body movements. It describes the attraction between two bodies as a force proportional to the product of their masses and inversely proportional to the squared distance between them. It represents an excellent approximation of Einstein's general theory of relativity in most usual cas