Example image of eyePlorer eyePlorer map for 'Newton's law of universal gravitation': Empirical Physical law Classical mechanics Philosophiæ Naturalis Principia Mathematica Force Line (geometry) Point particle Robert Hooke Royal Society Gravitational constant Mass Product (mathematics) Proportionality (mathematics) Square (algebra) International System of Units Kilogram Metre Newton (unit) Cavendish experiment Henry Cavendish United Kingdom Coulomb's law Inverse-square law Vacuum permittivity General relativity Isaac Newton Edmond Halley Integral Physical body Shell theorem Equation Euclidean vector Scalar (physics) Unit vector Vector field Gravitational acceleration Conservative vector field Gravitational potential Speed of light Standard Model Theory of everything Action at a distance (physics) Apsis Mercury (planet) Orbit Planet Precession Minute of arc Mechanical explanations of gravitation Hypotheses non fingo