Answer
$U = -4.53\times 10^{11}~J$
Work Step by Step
We can find the gravitational potential energy:
$U = -\frac{GMm}{r}$
$U = -\frac{(6.67\times 10^{-11}~N~m^2/kg^2)(9.50\times 10^{25}~kg)(3000~kg)}{4.20\times 10^7~m}$
$U = -4.53\times 10^{11}~J$
