Consider a cluster of galaxies. What is increasing because of the Hubble flow?
A) the average distance between galaxies within the cluster
B) the sizes of the galaxies within the cluster
C) the distance between the cluster and other distant clusters of galaxies
D) the average distance between the stars in each of the cluster galaxies

Question

Quizplus · Accepted Answer

The Hubble flow refers to the observation that galaxies are moving away from each other due to the expansion of the universe. This means that the distance between different clusters of galaxies is increasing over time.

Consider a Cluster of Galaxies