"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion." ― Isaac Newton From Isaac Newton Mathematician Added on 1/31/2026 About Isaac Newton Isaac Newton was an English mathematician and physicist whose work transformed mechanics, optics, and astronomy. His formulation of the laws of motion and universal gravitation became foundational to classical physics. Born: 1642-12-25 Died: 1727-03-31 View all quotes from Isaac Newton