What do we mean when we say that the rotation curve for a spiral galaxy is "flat"?
A) Gas clouds orbiting far from the galactic center have approximately the same orbital speed as gas clouds located further inward.
B) The amount of light emitted by stars at different distances is about the same throughout the galaxy.
C) The disk of a spiral galaxy is quite flat rather than spherical like the halo.
D) All the galaxy's mass is concentrated in its flat, gaseous disk.
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