Question 1

What observations indicate the presence of dust in the interstellar medium?

Accepted Answer

The dust in the ISM makes distant stars

Question 2

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 3

Which telescope imaged the center of the Milky Way Galaxy at a wavelength of 8 microns to reveal the distribution of the dusty interstellar medium?

Accepted Answer

A)  Spitzer Space Telescope 
B)  infrared telescope 
C)  European Southern Observatory 
D)  X-ray telescope 
E)  radio telescope 
A)  Spitzer Space Telescope 
B)  infrared telescope 
C)  European Southern Observatory 
D)  X-ray telescope 
E)  radio telescope

Question 4

Which mission passed the bow shock in the Universe?

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 5

______________ are cool, with temperatures of about 100 K and densities of ten to a few hundreds of atoms per cubic centimeter.

Accepted Answer

The answer of ______________ are cool, with temperatures of about...

Question 6

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

Accepted Answer

Pressure is a measure of the force that

Question 7

The emission lines from O III are called ____ because they are not visible laboratories on Earth due to the much greater pressure of the gas on Earth.

Accepted Answer

A)  unique lines 
B)  unresolved lines 
C)  forbidden lines 
D)  unseen lines 
E)  "fathom" lines 
A)  unique lines 
B)  unresolved lines 
C)  forbidden lines 
D)  unseen lines 
E)  "fathom" lines

Question 8

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 9

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

Question 10

Large molecular clouds will form into protostars because of ____.

Accepted Answer

A)  the thermal motions of the atoms in the gas cloud 
B)  gravitational contraction 
C)  radiation pressure from nearby stars 
D)  the temperature reaching a critical point 
E)  condensation of dust and gas 
A)  the thermal motions of the atoms in the gas cloud 
B)  gravitational contraction 
C)  radiation pressure from nearby stars 
D)  the temperature reaching a critical point 
E)  condensation of dust and gas

Question 11

The pressure of a gas depends on the ____ and ____ of the gas.

Accepted Answer

A)  density; volume 
B)  temperature; density 
C)  temperature; mass 
D)  temperature; volume 
E)  density; mass 
A)  density; volume 
B)  temperature; density 
C)  temperature; mass 
D)  temperature; volume 
E)  density; mass

Question 12

List the three types of nebulae in the Interstellar Medium.

Accepted Answer

H II  regions (or em

Question 13

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 14

If hydrogen (H2) gas is the most common molecule found within the interstellar medium, then why do astronomers measure the amount of carbon monoxide (CO) gas to map molecular clouds?

Accepted Answer

Hydrogen (H₂ is the most common molecule

Question 15

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

Question 16

Interstellar dust scatters _____________light more than _____________light.

Accepted Answer

The answer of Interstellar dust scatters _____________light more than _____________light....

Question 17

At infrared wavelengths, the ISM glows with blackbody radiation emitted by the interstellar dust.

Accepted Answer

A) True 
 B)False

Question 18

Calculations of the Sun's future evolution indicate that it will blow away almost half of its mass in several relatively short episodes about 4 to 5 billion years from now before it is finally extinguished.

Accepted Answer

A) True 
 B)False

Question 19

The interstellar medium is composed of mainly _____.

Accepted Answer

A)  equal parts of gas and dust 
B)  mostly dust and some gas 
C)  mostly gas and some dust 
D)  dust only 
E)  gas only 
A)  equal parts of gas and dust 
B)  mostly dust and some gas 
C)  mostly gas and some dust 
D)  dust only 
E)  gas only

Question 20

H I clouds can be observed using _____.

Accepted Answer

A)  optical telescopes above the Earth's atmosphere 
B)  21-cm radiation 
C)  x-ray radiation 
D)  infrared radiation 
E)  ultraviolet radiation 
A)  optical telescopes above the Earth's atmosphere 
B)  21-cm radiation 
C)  x-ray radiation 
D)  infrared radiation 
E)  ultraviolet radiation

What observations indicate the presence of dust in the interstellar medium?

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

Which telescope imaged the center of the Milky Way Galaxy at a wavelength of 8 microns to reveal the distribution of the dusty interstellar medium?

Which mission passed the bow shock in the Universe?

______________ are cool, with temperatures of about 100 K and densities of ten to a few hundreds of atoms per cubic centimeter.

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

The emission lines from O III are called ____ because they are not visible laboratories on Earth due to the much greater pressure of the gas on Earth.

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

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

Large molecular clouds will form into protostars because of ____.

The pressure of a gas depends on the and of the gas.

List the three types of nebulae in the Interstellar Medium.

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

If hydrogen (H₂) gas is the most common molecule found within the interstellar medium, then why do astronomers measure the amount of carbon monoxide (CO) gas to map molecular clouds?

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

Interstellar dust scatters _light more than _light.

At infrared wavelengths, the ISM glows with blackbody radiation emitted by the interstellar dust.

Calculations of the Sun's future evolution indicate that it will blow away almost half of its mass in several relatively short episodes about 4 to 5 billion years from now before it is finally extinguished.

The interstellar medium is composed of mainly _____.

H I clouds can be observed using _____.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

Formation and Structure of Stars

Stellar Evolution

Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies

Supermassive Black Holes and Active Galaxies

Modern Cosmology

Astrobiology

Filters

Exam 10: The Interstellar Medium

What observations indicate the presence of dust in the interstellar medium?

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

Which telescope imaged the center of the Milky Way Galaxy at a wavelength of 8 microns to reveal the distribution of the dusty interstellar medium?

Which mission passed the bow shock in the Universe?

______________ are cool, with temperatures of about 100 K and densities of ten to a few hundreds of atoms per cubic centimeter.

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

The emission lines from O III are called ____ because they are not visible laboratories on Earth due to the much greater pressure of the gas on Earth.

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

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

Large molecular clouds will form into protostars because of ____.

The pressure of a gas depends on the ____ and ____ of the gas.

List the three types of nebulae in the Interstellar Medium.

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

If hydrogen (H2) gas is the most common molecule found within the interstellar medium, then why do astronomers measure the amount of carbon monoxide (CO) gas to map molecular clouds?

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

Interstellar dust scatters _____________light more than _____________light.

At infrared wavelengths, the ISM glows with blackbody radiation emitted by the interstellar dust.

Calculations of the Sun's future evolution indicate that it will blow away almost half of its mass in several relatively short episodes about 4 to 5 billion years from now before it is finally extinguished.

The interstellar medium is composed of mainly _____.

H I clouds can be observed using _____.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

Formation and Structure of Stars

Stellar Evolution

Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies

Supermassive Black Holes and Active Galaxies

Modern Cosmology

Astrobiology

Filters

The pressure of a gas depends on the and of the gas.

If hydrogen (H₂) gas is the most common molecule found within the interstellar medium, then why do astronomers measure the amount of carbon monoxide (CO) gas to map molecular clouds?

Interstellar dust scatters _light more than _light.