The black hole at the center of the galaxy M87 is estimated to have a mass of 3 * 109 MSun. Suppose the orbits of the stars observed circling it have semimajor axes of 50 au. Approximately what would be the period of their orbital motion?
A) 3 seconds
B) 24 days
C) 7 years
D) 127 years
Correct Answer:
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