Halo stars with fewer absorption lines than disk stars provides evidence:
A. that the Milky Way became thinner and flatter as it evolved.
B. that halo stars are younger than disk stars.
C. of the Milky Way's spiral arm structure.
D. of unequal amounts of matter and antimatter.
Answer:A
Halo stars with fewer absorption lines than disk stars provides evidence:
A. that the Milky Way became thinner and flatter as it evolved. B. that halo stars are younger than disk stars. C. of the Milky Way's spiral arm structure. D. of unequal amounts of matter and antimatter.