How Can We Measure the Mass of an Elliptical Galaxy

question 46

Multiple Choice

How can we measure the mass of an elliptical galaxy?

• A) by measuring the speeds of stars in the nucleus
• B) by observing the velocity of the hot, X-ray-emitting gas that surrounds the galaxy
• C) by measuring the number of H II regions in the galaxy
• D) by measuring how many supernovae go off each century
• E) by measuring the amount of blue light in the galaxy

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