Answer
$$F = 4.1 \times 10^{-8} N $$
Work Step by Step
$$F= G \frac{m_{1} m_{2}}{d^{2}} = (6.67 \times 10^{-11} \frac {N \cdot m^{2}}{kg^{2}}) \frac{(3.0 kg )(6.4 \times 10^{23} kg)}{(5.6 \times 10^{10} m)^{2}}$$
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