Two galaxies are orbiting around a common center of mass. One galaxy is nearer and other is farther. Which one takes more time for orbiting?

1 Answer
Shwetank Mauria
Dec 20, 2017

According to Kepler's law, farther galaxy takes longer time. According to this the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. As it is based on gravitational force, it applies to this case as well.

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