Which of the following methods used to determine the mass of a cluster does not depend on Newton's laws of gravity?
A. measuring the orbital velocities of galaxies in a cluster
B. measuring the temperature of X-ray gas in the intracluster medium
C. measuring the amount of distortion caused by a gravitational lens
D. none of the above
Answer:C
Which of the following methods used to determine the mass of a cluster does not depend on Newton's laws of gravity?
A. measuring the orbital velocities of galaxies in a cluster B. measuring the temperature of X-ray gas in the intracluster medium C. measuring the amount of distortion caused by a gravitational lens D. none of the above