Review Questions
By Formative Library
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Last updated about 3 years ago
12 Questions
1 point
1
Question 1
1.
Identify several dark nebulae in photographs in this chapter. Give the figure numbers of the photographs, and specify where the dark nebulae are to be found on them.
Identify several dark nebulae in photographs in this chapter. Give the figure numbers of the photographs, and specify where the dark nebulae are to be found on them.
1 point
1
Question 2
2.
Why do nebulae near hot stars look red? Why do dust clouds near stars usually look blue?
Why do nebulae near hot stars look red? Why do dust clouds near stars usually look blue?
1 point
1
Question 3
3.
Describe the characteristics of the various kinds of interstellar gas (HII regions, neutral hydrogen clouds, ultra-hot gas clouds, and molecular clouds).
Describe the characteristics of the various kinds of interstellar gas (HII regions, neutral hydrogen clouds, ultra-hot gas clouds, and molecular clouds).
1 point
1
Question 4
4.
Prepare a table listing the different ways in which dust and gas can be detected in interstellar space.
Prepare a table listing the different ways in which dust and gas can be detected in interstellar space.
1 point
1
Question 5
5.
Describe how the 21-cm line of hydrogen is formed. Why is this line such an important tool for understanding the interstellar medium?
Describe how the 21-cm line of hydrogen is formed. Why is this line such an important tool for understanding the interstellar medium?
1 point
1
Question 6
6.
Describe the properties of the dust grains found in the space between stars.
Describe the properties of the dust grains found in the space between stars.
1 point
1
Question 7
7.
Why is it difficult to determine where cosmic rays come from?
Why is it difficult to determine where cosmic rays come from?
1 point
1
Question 8
8.
What causes reddening of starlight? Explain how the reddish color of the Sun’s disk at sunset is caused by the same process.
What causes reddening of starlight? Explain how the reddish color of the Sun’s disk at sunset is caused by the same process.
1 point
1
Question 9
9.
Why do molecules, including H2 and more complex organic molecules, only form inside dark clouds? Why don’t they fill all interstellar space?
Why do molecules, including H2 and more complex organic molecules, only form inside dark clouds? Why don’t they fill all interstellar space?
1 point
1
Question 10
10.
Why can’t we use visible light telescopes to study molecular clouds where stars and planets form? Why do infrared or radio telescopes work better?
Why can’t we use visible light telescopes to study molecular clouds where stars and planets form? Why do infrared or radio telescopes work better?
1 point
1
Question 11
11.
The mass of the interstellar medium is determined by a balance between sources (which add mass) and sinks (which remove it). Make a table listing the major sources and sinks, and briefly explain each one.
The mass of the interstellar medium is determined by a balance between sources (which add mass) and sinks (which remove it). Make a table listing the major sources and sinks, and briefly explain each one.
1 point
1
Question 12
12.
Where does interstellar dust come from? How does it form?
Where does interstellar dust come from? How does it form?
Please take the time to check out the source for this material from Openstax if you plan to use this in your lesson plan!: https://openstax.org/books/astronomy/pages/20-review-questions