Why do stars in the halo of the galaxy have almost no heavy elements such as carbon, nitrogen, and oxygen?
A.) Those elements have been used up in halo stars.
B.) Heavy elements are biological, and there is no life out there to make them.
C.) Halo stars formed before those elements were made.
D.) Making C, N, and O requires massive stars, and there are no massive stars in the halo.
E.) None of the above.
Ans: C.) Halo stars formed before those elements were made.
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