If you found a halo star that was 13 billion years old and had the same amount of heavy elements as the Sun, would you be surprised?
A) No; many halo stars have high fractions of heavy elements.
B) No; this star probably escaped from a globular cluster.
C) No; this star has been around a long time, and has created a lot of heavy elements through nuclear fusion.
D) Yes, because most halo or globular cluster stars have few heavy elements.
E) Yes; halo stars mostly have ages less than 10 billion years.
Correct Answer:
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