If a Disk Galaxy Is Reasonably Close and Edge-On,the Doppler

question 56

Multiple Choice

If a disk galaxy is reasonably close and edge-on,the Doppler shift of the galaxy disk material relative to the centre can be measured at several distances from the galaxy's centre.What does this measurement tell us about the galaxy?

• A)the galaxy's luminosity
• B)the galaxy's diameter
• C)the galaxy's mass
• D)the galaxy's velocity dispersion curve

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