Does Hubble's law work well for galaxies in the Local Group? Why or why not?
  • 32,500 km/s
  • The recession velocity of a galaxy is directly proportional to its distance from us.
  • No, because galaxies in the Local Group are gravitationally bound together.
  • Dr. X believes that the universe is older than Dr. Y believes.
Cosmological redshift is the result of ___________.
  • They were more common when the universe was younger.
  • redder and rounder.
  • the expansion of the universe
  • the one that is farthest away
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