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The value of the gravitational constant $G$ is $6.67384\times 10^-11 {\rm m}^3{\rm kg}^{-1}{\rm s}^{-2}$. This value is used in the formula to calculate the attractive force between two objects with mass, my question is:

since it is a constant why does it have units? As it has unit can it be directly measured?

I understand that the gravitational constant is not the acceleration force exerted by an object with mass such as earth.

is it related to a hypothetical force carrier, the graviton, since the value seems incredibly small? or maybe since the unit contains measurement of units in 3d space it has something to do with special relativity?

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The gravitational constant is an empirical physical constant found through experimentation, a famous one being the Cavendish experiment.

You can read more about it here.

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