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A map of our Galaxy deduced from radio observations of the 21-cm line emission from cool hydrogen ...

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A map of our Galaxy deduced from radio observations of the 21-cm line emission from cool hydrogen ...

A map of our 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.

Textbook

Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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