Three galaxies, each of mass m = 4.0 × 1041 kg, lie in a plane at the corners of an equilateral triangle with sides of 5.0 × 1022 m length. The magnitude of the force the other two galaxies exert on each galaxy is
A. 4.3 × 1027 N.
B. 6.4 × 1027 N.
C. 7.4 × 1027 N.
D. 8.6 × 1027 N.
E. 4.3 × 1028 N.
Answer: C
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