$\text{F}=\text{G}\frac{{\text{m}}_{\text{1}}{\text{m}}_{\text{2}}}{{\text{r}}^{\text{2}}}$  this force is always

The gravitational force between any two bodies that have some mass is given as:

${\text{F}}_{ }=\text{G}.\frac{{\text{m}}_{\text{1}}{\text{m}}_{\text{2}}}{{\text{r}}_{ }^2}$
Where m₁ and m₂ are the masses of the two bodies, r is the distance between them and G is the universal gravitation constant.
$G= 6.67 X {10}^{-11} N{m}^2/k{g}^2$

The nature of the gravitational force is always attractive.