Questions for Review


1			What does the Milky Way look like in the night sky?




2			How do we know our galaxy is a flat disk?




3			Draw a sketch of the Milky Way galaxy and label its major components. Where is the Sun in the Milky Way?




4			Roughly how big in diameter is our galaxy, and how much mass does it contain?




5			How did Shapley deduce the Milky Way's size and the Sun's position in it?




6			What are some differences between Pop I and Pop II stars?




7			How do we know interstellar matter exists?




8			How do we know that some interstellar matter is dust?




9			What is the difference between an emission and a reflection nebula?




10			What are the small, reddish blobs along the spiral arms of the galaxy in figure 15.7?




11			How does interstellar dust affect our observations of stars and the Milky Way?




12			What is the zone of avoidance?




13			What evidence makes astronomers believe the Milky Way has spiral arms?




14			What are some ways that we know cold clouds of gas exist in space?




15			How can we determine the Milky Way's diameter?




16			How can we determine the Milky Way's mass?




17			What is meant by dark matter? Why do astronomers conclude the Milky Way may contain such as yet unobserved material?




18			What is the evidence for a black hole at the center of the Milky Way?




19			Describe one model for the origin of the Milky Way. How does this model explain the difference between Pop I and Pop II stars?




20			What is meant by Pop III stars?

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Explorations: Introduction to Astronomy (Arny), 6th Edition

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