Explaining the Inverse Square Law of Gravity

mars shaw
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Why gravity follows inverse square law? How Einstein explained it?
Can someone explain it please?
 
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For such a general question do the following steps:

1) www.wikipedia.org

2) Type General Relativity

3) Start Reading

4) Find specific questions
 
Or:

1. www.wikipedia.org

2. type "inverse square law"

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From $$0 = \delta(g^{\alpha\mu}g_{\mu\nu}) = g^{\alpha\mu} \delta g_{\mu\nu} + g_{\mu\nu} \delta g^{\alpha\mu}$$ we have $$g^{\alpha\mu} \delta g_{\mu\nu} = -g_{\mu\nu} \delta g^{\alpha\mu} \,\, . $$ Multiply both sides by ##g_{\alpha\beta}## to get $$\delta g_{\beta\nu} = -g_{\alpha\beta} g_{\mu\nu} \delta g^{\alpha\mu} \qquad(*)$$ (This is Dirac's eq. (26.9) in "GTR".) On the other hand, the variation ##\delta g^{\alpha\mu} = \bar{g}^{\alpha\mu} - g^{\alpha\mu}## should be a tensor...

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