Explorations: An Introduction to Astronomy (Arny), 7th Edition

Chapter 16: The Milky Way Galaxy

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
How did Shapley deduce the Milky Way's size and the Sun's position in it?
4
Draw a sketch of the Milky Way Galaxy and label its major components. Where is the Sun in the Milky Way?
5
Roughly how big in diameter is our Galaxy, and how much mass does it contain?
6
What are some differences between Pop I and Pop II stars?
7
Summarize the differences between open and globular clusters. Are both still forming today in the Milky Way?
8
How do we know interstellar matter exists? What different kinds and forms are there?
9
How do we know that some interstellar matter is dust? What is the other main category of interstellar matter?
10
How does interstellar dust affect our observations of stars, the Milky Way, and other galaxies? What is the zone of avoidance?
11
What is the difference between an emission and a reflection nebula?
12
What are some ways that we know cold clouds of gas exist in space?
13
What evidence makes astronomers conclude the Milky Way has spiral arms?
14
How is star formation related to spiral arms?
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? How does it compare to the black holes discussed in chapter 15?
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
How do mergers affect the evolution of the Milky Way?
21
What is meant by Pop III stars?
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