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1. What is the "Milky Way" in our sky?
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2. Why were astronomers such as William Herschel wrong about the size of our galaxy and the location of our Sun in the galaxy?
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3. Infrared and radio wavelengths are the most useful wavelengths in which to explore the disk portion of our galaxy. Why? What have these studies revealed about the disk?
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4. What are the three components of our galaxy's visible matter?
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5. List three components of the galaxy's "invisible" composition.
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6. Summarize the differences in Population I and Population II stars. What is the reason for these differences?
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7. What are spiral arms? Why are they so visible in optical telescope pictures?
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8. What is the composition of the interstellar medium?
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9. What are H I and H II regions and where are they found?
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10. Approximately 99 percent
of the instellar medium is gas. What is the other 1 percent? What is its suspected source?
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11. Why is Aluminum-26 an important tool in studying the interstellar medium?
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