Q1) List the different parts of a normal spiral galaxy and indicate what type or types of objects we might find in each of these parts.

Q2) Describe two techniques for measuring the mass of a galaxy. Do not merely list them but go into a little detail about how we actually use the individual techniques to measure a galaxy's mass.

Q3) Why do astronomers believe that considerable quantities of dark matter must exist in clusters of galaxies? Explain why this dark matter is galaxy clusters cannot be neutral hydrogen.

Q4) What is the Hubble classification scheme? Which category includes the biggest galaxies? Into which category do the smallest galaxies fall? Which type of galaxy is the most common? In which type of galaxy are new stars most commonly forming? Describe the observational evidence that supports your answer.

PLEASE TYPE BECAUSE I HAVE ISSUES UNDERSTANDIG HANDWRITING