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{excerpt} The [force] of attraction between two masses, especially that between the Earth and another body.{excerpt}This force is proportional to the masses of the two bodies and inversely proportional to the distance between them.

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{latex}\begin{large} \[F_{g} = \frac{GM_{1}M_{2}}{{r_{1,2}}^{2}} \]\end{large}{latex}


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Here *M{~}1{~}* and *M{~}2{~}* are the masses, {*}r{~}1,2{~}{*} is their separation, and *G* is the constant of proportionality, called the *Gravitational Constant*. 



{latex}\begin{large} \[ G = (6.67428 \pm 0.00067) \times 10^{-8} \frac{cm^{3}}{g \; sec^{2}} \]\end{large}{latex}



See [gravity|gravity (near-earth)] for more details.