1. Discuss the advantages and disadvantages (e.g., reliability, repeatability, etc.) of using the various standard candles to determine extragalactic distances.
2. Discuss whether the various Hubble types of galaxies actually represent some sort of evolutionary sequence.
3. Discuss the sorts of phenomena that can occur when galaxies collide. Do you think that such collisions can change the Hubble type of a galaxy? Explain.
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