Multiple Choice
A map of the Milky Way Galaxy deduced from radio observations of the 21-cm line emission from cool hydrogen gas and observations of spiral arm tracers such as giant molecular clouds reveals
A) two spiral arms, one on each side of the Galaxy.
B) a smooth distribution of stars, characteristic of an elliptical galaxy.
C) at least four spiral arms.
D) one spiral arm that wraps around the Galaxy several times.
Correct Answer:
Verified
Correct Answer:
Verified
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