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.

Question

Quizplus · Accepted Answer

Astronomers detect dark matter in galaxy clusters by observing gravitational lensing, which requires more mass than visible matter alone can account for.

Which of the Following Is a Way in Which Astronomers