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1. What are the three Hubble classes of galaxies and how are they further divided into subclasses?
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2. Do galaxies evolve through time from one type of galaxy to another?
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3. Describe the Local Group of galaxies to which our Milky Way Galaxy belongs.
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4. Distinguish between the poor and rich, and regular and irregular clusters of galaxies.
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5. How did the study of clusters of galaxies reveal that 90-99 percent of the mass of the Universe is invisible Dark Matter? What are some possibilities for the identity
of this Dark Matter?
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6. What is the Great Attractor and the evidence for its existence?
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7. What are the most important standard candles in establishing the extra-galactic distance scale?
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8. What is Hubble's law and what does it tell us about the Universe?
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9. What have the recent three-dimensional surveys of the Universe revealed about the large-scale structure of the Universe?
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