Review4

Review4 - Review4 Chapters22:TheMilkyway

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Review 4  Chapters 22: The Milky way How do we know that there is gas and dust in interstellar space? How were the  size and shape of the Milky Way discovered? What is the shape, form, structure,  and various parts of the Milky Way? Where is our sun located in the Milky Way?  Why do astronomers think that much of the Milky Way consists of “dark matter”?  Why does the galaxy have spiral arms? Is there a massive black hole at the  center of the galaxy? What is an HII region and how does it evolve?  What is the  origin of the 21 cm line and how do we utilize it in astronomy? What are the  various types of nebulae in the Milky Way?  Chapter 23: What are the different kinds of galaxies?  How have astronomers determined the  distances to galaxies?  What makes astronomers think that galaxies contain vast  amounts of dark matter?  How do we think galaxies formed?  Why do nearly all 
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Review4 - Review4 Chapters22:TheMilkyway

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