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A radio astronomer points a radio telescope through the Galaxy's disk in a direction directly away ...

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A radio astronomer points a radio telescope through the Galaxy's disk in a direction directly away ...

A radio astronomer points a radio telescope through the Galaxy's disk in a direction directly away from the center of the Galaxy. If the astronomer measures the Doppler shifts of the 21-cm radio line of hydrogen from interstellar clouds at several different distances from the Sun along this line of sight, what should be the result? (Fig. 15-8 of Comins and Kaufmann, Discovering the Universe, 7th Ed., may be helpful.)
A)   The Doppler shift should have a constant value, regardless of distance, as a result of the Sun's speed of motion around the center of the Galaxy.
B)   The Doppler shift should be almost zero for all clouds, regardless of distance.
C)   The Doppler shift should rise to a maximum at some distance, then decrease again.
D)   The Doppler shift should be larger the farther away the cloud is.

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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This helped my grade so much Perfect

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I appreciate what you did here, answered it right Smiling Face with Open Mouth

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