One difference between Population I and Population II stars in the Milky Way is
A. that Pop I stars produce energy by fusion and Pop II stars through gravitational contraction.
B. that Pop I stars produce energy by fusion and Pop II by fission.
C. that Pop I stars have orbits in the disk and Pop II stars have orbits that pass through the disk.
D. that Pop I stars have very few metals and Pop II stars are metal rich.
Answer: C
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