How do two stars in a binary system orbit each other? (See Figure 17-21.(in the text) )
A) They both follow elliptical orbits around a common point between the stars.
B) The lower mass star orbits in an ellipse around the center of the larger mass star.
C) The larger mass star orbits around the center of the smaller mass star.
D) They both move on the same elliptical orbit around one of its foci.
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