1. .A large galaxy contains mostly old (Pop II) stars spread smoothly throughout its volume, but it has little dust or gas. What type galaxy is it most likely to be?
2. A galaxy's spectrum has a redshift of 30,000 kilometers per second. If the Hubble constant is 75 kilometers per second per megaparsec, how far away from Earth is the galaxy?
3.The Local Group
4. A spiral galaxy has a small bright central region and its spectrum
shows that it contains hot, rapidly moving gas. It is most likely a
5. Astronomers believe that dark matter exists because