Gravitational constant

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G is the universal gravitational constant:

$G = 6.67 \times 10^{-11} \ \mbox{N} \ \mbox{m}^2 \ \mbox{kg}^{-2} \$

It is used in Newton's formula for the gravitational force between two objects, which is:

$F = G \frac{m_1 m_2}{r^2}$
where
${F} \$ is the force between the two objects
${m_1},{m_2} \$ are the masses of each object
${r} \$ is the distance between the two objects.

g is the acceleration Earth's gravitational field exerts on objects at Earth's surface:

$g = 9.81 \ \mbox{m} \ \mbox{sec}^{-2}$