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http://en.wikipedia.org/wiki/Inverse-square_law

In physics, an inverse-square law is any physical law stating that a specified physical quantity or intensity is inversely proportional to the square of the distance from the source of that physical quantity. In equation form:

\mbox{Intensity} \ \propto \ \frac{1}{\mbox{distance}^2} \,

The divergence of a vector field which is the resultant of radial inverse-square law fields with respect to one or more sources is everywhere proportional to the strength of the local sources, and hence zero outside sources. Newton’s law of universal gravitation follows an inverse-square law, as do the effects of electricmagneticlightsound, and radiationphenomena.

[youtube=https://www.youtube.com/watch?v=CpNw1XqDI3w&w=560&h=315]

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