Denotes the **gravitational constant **in mathematical notation.

**G **is the constant term in Newton's law of universal gravitation, which states: "The attractive force (F) between two bodies is proportional to the product of their masses (m_{1} and m_{2}), and inversely proportional to the square of the distance (*r*) between them."

Not to be confused with **g**, the local gravitational field, which is the attractive force exerted by the Earth on a sky diver in free fall.

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