The rotation curve of a galaxy is a plot of the rotation speed as a function of the
A) galaxy's luminosity.
B) mass of the dark matter halo.
C) brightness of the luminous matter in the galaxy.
D) radius from the center.
E) ages of star clusters.

Question

Quizplus · Accepted Answer

The rotation curve of a galaxy is a plot of the rotation speed of objects within the galaxy as a function of their distance (radius) from the center of the galaxy.

The Rotation Curve of a Galaxy Is a Plot of the Rotation