The Mass of Visible Matter in a Galaxy Can Be

question 40

Multiple Choice

The mass of visible matter in a galaxy can be estimated by measuring its luminosity. When this is compared with the measured mass of the galaxy, astronomers find that ____.

• A) the measured mass is about ten times the estimated mass, due to the effects of the central black hole
• B) the measured mass is approximately equal to the estimated mass
• C) there is no clear relationship between the estimated and measured mass
• D) the measured mass is about ten times the estimated mass, due to the effects of dark matter
• E) the estimated mass is about ten times the measured mass, due to the effects of dark matter

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