Calculating Gravitational Field: A Refresh

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seto6
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been a while since i have done physic... for got how to calculate gravitational filed...

<THIS IS NOT A HOMEWORK QUESTION>
 
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Gravitational force : F = GMm/r^2
Gravitational potential : U = -GMm/r
 
[tex]-G \frac{m_1}{r^2}[/tex]
or in vector form, which I prefer to use:
[tex]-G \frac{m_1}{\left\| \boldsymbol{r} \right\|^2} \boldsymbol{\hat{r}} \,.[/tex]