Which of the following properties is more likely to be a characteristic of a halo star in the Milky Way, not a disk star?
A)It has a low ratio of iron to hydrogen.
B)It is moving very slowly relative to the Sun's motion.
C)It could be quite young.
D)It orbits the center of the Milky Way galaxy.

Question

Quizplus · Accepted Answer

Halo stars are older and formed early in the galaxy's history, when the universe had a lower abundance of heavy elements (like iron) compared to hydrogen. Disk stars, which formed later, tend to have higher ratios of heavy elements due to the recycling of materials from previous generations of stars.

Which of the Following Properties Is More Likely to Be