Gravity, Universal Gravitation Constant - Gravitational Force Between Earth, Moon & Sun, Physics
Determining Gravitational Constant
The Gravitational Constant
Newtonian Gravity: Crash Course Physics #8
The gravitational constant, denoted by the letter G, is an empirical physical constant involved in the calculation of gravitational effects in Sir Isaac Newton's law of universal gravitation and in Albert Einstein's general theory of relativity.