What is a rotation curve?
A) a graph that shows a galaxy's mass on the vertical axis and size on the horizontal axis
B) a precise description of the shape of a star's orbit around the center of the Milky Way Galaxy
C) a graph showing how orbital velocity depends on distance from the center for a spiral galaxy
D) a curve used to decide whether a star's orbit places it in the disk or the halo of a spiral galaxy
Correct Answer:
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