1. A cluster of galaxies in the southern constellation of Pavo (the Peacock) is located 100 Mpc from Earth. How fast, on average, are galaxies in this cluster receding from us? Why do different...

1. A cluster of galaxies in the southern constellation of Pavo (the Peacock) is located 100 Mpc from Earth. How fast, on average, are galaxies in this cluster receding from us? Why do different galaxies in the cluster show different velocities?

2. How would you determine what fraction of a distant galaxy’s redshift is caused by the galaxy’s orbital motion around the center of mass of its cluster?