Mars has a mass of about 6.09 x 1023 kg, and its moon Phobos has a mass of about 9.4 x 10 kg. If the magnitude of the gravitational force between the two bodies is 4.61 x 105 N, how far apart are Mars and Phobos? The value of the universal gravitational constant is 6.673 x 1011 N. m²/kg². Answer in units of m.
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