The universal gravitational constant, denoted by the letter G, is a physical constant that describes the strength of gravitational force between any two objects with mass. It was first formulated by Sir Isaac Newton in his law of universal gravitation and is a fundamental constant in physics, with a value of approximately 6.674 10^-11 m^3 kg^-1 s^-2. The universal gravitational constant is used to calculate the force of gravity between any two objects, regardless of their size or distance from each other.
The universal gravitational constant is an important constant in physics, as it allows us to calculate the force of gravity between any two objects. This force is responsible for keeping the planets in orbit around the sun, the moon in orbit around the Earth, and galaxies bound together. Without gravity, these objects would fly apart in all directions.