If most of the mass of a galaxy is located near the center of the galaxy,then in the outer part of this galaxy we would expect the orbital speeds of stars to decrease with increasing distance from the center.This behavior would be equivalent to:

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Quizplus · Accepted Answer

This behavior is equivalent to Kepler's third law, which states that the orbital period and distance of a planet or star are related to the mass of the object being orbited. In this case, the decrease in orbital speeds with increasing distance from the center of the galaxy indicates a decrease in the mass being orbited, consistent with Kepler's third law.

If Most of the Mass of a Galaxy Is Located