MICHAEL S. answered 01/13/17
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From what's provided, I'm presuming you want to determine the Gravitational Force between Saturn and Mars.
The gravitational force, FG, is given by the following equation:
FG = G M1 M2 / R2, where
G = 6.673 x 10-11 N km2 / kg2 (universal gravitational constant)
M1 = 568.36 x 1024 kg (mass of Saturn)
M2 = 639 x 1021 kg (mass of Mars)
R = 1.2 x 109 km (distance between Saturn and Mars)
Simplification: The radii of the planets are negligible relative to the distance between them so that we don't have to factor in the radii of the planets in the calculation.