The cluster method (motions of galaxies in a cluster of galaxies) can be used to determine the cluster's
A) luminosity.
B) distance.
C) mass.
D) diameter.
E) age.

Question

Quizplus · Accepted Answer

The cluster method allows for the determination of a cluster's mass through the observation of the motions of the galaxies within it. The mass can then be used to understand other properties of the cluster, such as its gravitational influence on other galaxies and its evolutionary history.

The Cluster Method (Motions of Galaxies in a Cluster of Galaxies)