Multiple Choice
Why has star formation ceased in the galactic halo?
A) All of the galaxy's cool gas settled to the galactic plane long ago.
B) All the halo gas consists of elements with more protons than helium.
C) There are no white dwarf binaries to trigger star formation via their supernovae.
D) The halo has no gas at all.
Correct Answer:
Verified
Correct Answer:
Verified
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