An Astronomer Named _______________ Used Globular Clusters to Locate the Center

Q8: Spiral arms are obvious-easily-seen features-because they contain

Q9: Spiral density wave theory and self-sustaining star

Q10: The center of the galaxy has been

Q11: How have astronomers determined the mass of

Q12: The first stars formed in the Universe

Q14: O and B stars are important spiral

Q15: What is the correct ordering of galactic

Q16: Harlow Shapley made the first accurate determination

Q17: Discuss the evidence that supports the theory

Q18: The Sun orbits the center of the