The planet neptune has a mass of 1.02 x 10^26 kg, and earth's mass is 5.97 x 10^24 kg. what is the gravitational force between the planets when they are 4.5 billion kilometers apart?
A: 2.0 x 10^15
B: 2.0 x 10^21
C: 3.0 x 10^25
D: 3.0 x 10^31
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