Ch24 - Assignment: Chapter 24 Class: Astronomy I Date:...

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Assignment: Chapter 24 Class: Astronomy I Date: November 19th, 2007 Review Questions 1. Many astronomers believed that spiral nebulae were components of our Galaxy because a considerable number of nebulae are in fact scattered throughout the Milky Way. 2. Shapley argued that spiral nebulae were small, nearby objects scattered around our Galaxy like the globular clusters. Curtis argued that they were each a rotating system of stars like our own Galaxy. Since neither of them was able to provide conclusive evidence, nothing was decided. 3. Cepheid variables are quite luminous, and Hubble realized that for these luminous stars to appear as dim as they were on his photographs of Andromeda, Andromeda must be extremely far away. 4. Under good observing conditions, we can actually see Andromeda's central bulge with naked eye. 5. While the universe contains literally billions of galaxies, and galaxies are composed of billions of stars, we as a part of the galaxy cannot only have one star. 6. Hubble classified galaxies into four broad categories based on their appearance using Hubble classification. 7. Spiral galaxies would be more likely to be blue because they have ongoing star formations, which make them hot, thus blue. 8.
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This note was uploaded on 08/25/2008 for the course ASTRON 1 taught by Professor Jsepikas during the Winter '07 term at Pasadena City College.

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Ch24 - Assignment: Chapter 24 Class: Astronomy I Date:...

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