Sir Isaac Newton is credited with the discovery of gravity. His groundbreaking work, "Philosophiæ Naturalis Principia Mathematica," published in 1687, laid the foundation for classical mechanics. Newton formulated the law of universal gravitation, suggesting that every mass attracts every other mass with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centers. This discovery revolutionized our understanding of motion and the forces that govern the universe, paving the way for future scientific exploration and inquiry into gravitational theory.