What is the basic shape of a spiral galaxy?
A) a round, flat disk with long lanes of stars that curve outward from a round, nuclear region of uniform brightness
B) a round, flat disk with long lanes of stars that curve outward from the center of the galaxy
C) approximately spherical with long lanes of dark dust clouds curving through it in a spiral pattern
D) a round, thin disk of uniform brightness with its edges bent up and down into a spiral shape
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