Question 1

Stars are born from the interstellar medium, and aging or dying stars return gas and dust back into the interstellar medium.

Accepted Answer

A) True 
 B)False  True

Question 2

Observing at a wide range of wavelengths, astronomers have detected more than ______ different molecules in the ISM.

Accepted Answer

A)  10 
B)  20 
C)  50 
D)  100 
E)  150 
A)  10 
B)  20 
C)  50 
D)  100 
E)  150 E

Question 3

Molecular clouds are mapped using _____ gas instead of the most-abundant hydrogen because itradiates at radio wavelengths more efficiently.

Accepted Answer

A)  oxygen III 
B)  oxygen II 
C)  helium II 
D)  carbon monoxide 
E)  carbon dioxide 
A)  oxygen III 
B)  oxygen II 
C)  helium II 
D)  carbon monoxide 
E)  carbon dioxide D

Question 4

Describe three ways in which astronomers can distinguish between interstellar absorption lines and stellar absorption lines.

Accepted Answer

Some stellar spectra contain absorption

Question 5

Which type of nebulae is produced when short-wavelength scatters from the dust and displays a blue hue?

Accepted Answer

A)  emission nebulae 
B)  H I 
C)  reflection nebulae 
D)  dark nebulae 
E)  spectral type B6 
A)  emission nebulae 
B)  H I 
C)  reflection nebulae 
D)  dark nebulae 
E)  spectral type B6

Question 6

The coronal gas in the interstellar medium has very high temperatures similar to the Sun's corona.

Accepted Answer

A) True 
 B)False

Question 7

Which type of nebulaeare twisted and distorted clouds of gas and dust dense enough to obstruct the view of the more distant stars?

Accepted Answer

A)  emission nebulae 
B)  H I 
C)  reflection nebulae 
D)  dark nebulae 
E)  spectral type B6 
A)  emission nebulae 
B)  H I 
C)  reflection nebulae 
D)  dark nebulae 
E)  spectral type B6

Question 8

Distinguish between pressure and density .   How are they related to each other?

Accepted Answer

Pressure is a measure of the force that

Question 9

What produces the coronal gas?

Accepted Answer

1 Astronomers have evidence that most co

Question 10

Coronal gas emits x-rays and has temperatures of ____.

Accepted Answer

A)    K or higher 
B)  more than   K but less than   K 
C)  5000 K 
D)  between1000 K to 5000 K 
E)  less than 500K 
A)    K or higher 
B)  more than   K but less than   K 
C)  5000 K 
D)  between1000 K to 5000 K 
E)  less than 500K

Question 11

Which mission is mapping the heliosphere's boundary?

Accepted Answer

A)  Cassini-Huygens 
B)  Interstellar Boundary Explorer 
C)  Voyager I 
D)  Voyager II 
E)  Kepler 
A)  Cassini-Huygens 
B)  Interstellar Boundary Explorer 
C)  Voyager I 
D)  Voyager II 
E)  Kepler

Question 12

Match between columns
                        Premises: The hot space of ISMs with temperatures of a few thousand K and a density of only 0.1 atom per cubic centimeter found between the cool H I clouds
A chaotic shape that is usually twisted, flattened, and tangled
Highly ionized state
The part of the ISM that can only be detected with X-ray telescopes have has temperatures of 10 S1U1P1 6 S1S1P0 K or higher
The coolest temperature
ISM clouds of cool gas of only about 100 K and dust with densities ranging up to 100 atoms per cubic centimeter and observed only at infrared and radio wavelengths
Clouds of gas and dust with densities ranging from 100s-1000s particles per cubic centimeter, found deep inside the ISM, where it is protected from UV photons

Accepted Answer

The Answer of Coronal gas and Intercloud medium and Molecular is...

Question 13

X-rays come from certain regions of the interstellar medium because gas molecules in those regions are at a very high density.

Accepted Answer

A) True 
 B)False

Question 14

Nebula is just another name for the interstellar medium (ISM).

Accepted Answer

A) True 
 B)False

Question 15

Interstellar extinction and the reddening of light by the interstellar medium (ISM) are both caused by _____.

Accepted Answer

A)  atoms and molecules in the ISM 
B)  only  atoms in the ISM 
C)  only molecules in the ISM 
D)  only dust in the ISM 
E)  dust, atoms and molecules of the ISM 
A)  atoms and molecules in the ISM 
B)  only  atoms in the ISM 
C)  only molecules in the ISM 
D)  only dust in the ISM 
E)  dust, atoms and molecules of the ISM

Question 16

List the three types of nebulae in the Interstellar Medium.

Accepted Answer

H II  regions (or em

Question 17

What are "forbidden lines"? Briefly describe how they form.

Accepted Answer

Forbidden lines are certain lines in the

Question 18

_______________ require that a young hot star (T ≥ 25,000 K) be relatively nearby.

Accepted Answer

The answer of _______________ require that a young hot star...

Question 19

Because blue light has a shorter wavelength than red light, it will be more readily scattered.

Accepted Answer

A) True 
 B)False

Question 20

Coronal gas radiates energy at ______________ wavelengths.

Accepted Answer

The answer of Coronal gas radiates energy at ______________ wavelengths....

Exam 10: The Interstellar Medium

Stars are born from the interstellar medium, and aging or dying stars return gas and dust back into the interstellar medium.

Observing at a wide range of wavelengths, astronomers have detected more than ______ different molecules in the ISM.

Molecular clouds are mapped using _____ gas instead of the most-abundant hydrogen because itradiates at radio wavelengths more efficiently.

Describe three ways in which astronomers can distinguish between interstellar absorption lines and stellar absorption lines.

Which type of nebulae is produced when short-wavelength scatters from the dust and displays a blue hue?

The coronal gas in the interstellar medium has very high temperatures similar to the Sun's corona.

Which type of nebulaeare twisted and distorted clouds of gas and dust dense enough to obstruct the view of the more distant stars?

Distinguish between pressure and density . How are they related to each other?

What produces the coronal gas?

Coronal gas emits x-rays and has temperatures of ____.

Which mission is mapping the heliosphere's boundary?

X-rays come from certain regions of the interstellar medium because gas molecules in those regions are at a very high density.

Nebula is just another name for the interstellar medium (ISM).

Interstellar extinction and the reddening of light by the interstellar medium (ISM) are both caused by _____.

List the three types of nebulae in the Interstellar Medium.

What are "forbidden lines"? Briefly describe how they form.

_______________ require that a young hot star (T ≥ 25,000 K) be relatively nearby.

Because blue light has a shorter wavelength than red light, it will be more readily scattered.

Coronal gas radiates energy at ______________ wavelengths.

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Origins of Modern Astronomy

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