Because of an Obscuring Atmosphere,an Observer in a Distant Galaxy

question 5

Multiple Choice

Because of an obscuring atmosphere,an observer in a distant galaxy can only see the nearest 1,000 stars to his or her home planet.How could the observer most directly determine that he or she lives inside an elliptical galaxy?

• A) by measuring the brightnesses of the stars
• B) by mapping the locations of the stars on the sky
• C) by measuring the differences in velocities between the stars
• D) by measuring the masses of the stars

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