Which of the Following Is a Way in Which Astronomers

question 55

Multiple Choice

Which of the following is a way in which astronomers detect dark matter in clusters of galaxies?

• A) by determining the amount of mass necessary to gravitationally lens images of distant objects
• B) by directly measuring the dark matter using infrared light
• C) by measuring the peculiar velocity of the galaxy cluster
• D) by determining the amount of mass necessary to gravitationally collapse clouds of gas to form the number of stars present
• E) None of these; dark matter cannot be detected in any way.

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