How is the age of the galaxy determined?

How is the age of the galaxy determined?
 
  a. Measuring the metallicity of Population II stars.
  b. Finding the turnoff point in the H-R diagram of globular clusters.
  c. From the motion of stars in the galactic halo.
  d. Counting the number of open clusters in the spiral arms.

Question 2

Solar prominences have twisted and looped shapes because of the solar magnetic field.
 
  Indicate whether the statement is true or false

Question 3

If a star with a large peculiar proper motion and/or speed with respect a typical disk star is found what other property would you expect it to have?
 
  a. Low luminosity.
  b. Poor metal content compared to the Sun.
  c. Old age.
  d. All of the above.

Question 4

Solar flares have no known effect on Earth.
 
  Indicate whether the statement is true or false

Question 5

How did Harlow Shapley use the period-luminosity relationship of RR Lyrae variables to determine the size of the Milky Way galaxy?
 
  a. He determined the proper motion of globular clusters in the outer disk of the galaxy.
  b. He found the distances to individual variables free floating in the halo.
  c. He found the distances to open clusters found throughout the disk of the galaxy.
  d. He found the distances to globular clusters distributed about the center of the galaxy.