Question 1

The composition of the interstellar dust suggests that it is formed primarily in the atmospheres of cool stars.

Accepted Answer

A) True 
 B)False

Question 2

Elements such as carbon, silicon and oxygen have been produced in stars and expelled as stars age in the interstellar medium. This is most likely due to these elements having cooled and condensed from aging stars to form dust grains, and carried out by a powerful winds.

Accepted Answer

A) True 
 B)False

Question 3

Molecules in the interstellar medium emit radiation at what wavelengths?

Accepted Answer

A)  radio 
B)  microwave 
C)  visible light 
D)  ultraviolet 
E)  X-ray 
A)  radio 
B)  microwave 
C)  visible light 
D)  ultraviolet 
E)  X-ray

Question 4

The type of radiation that is emitted when the electron in a hydrogen atom experiences a spin flip is a (n) _______________.

Accepted Answer

The answer of The type of radiation that is emitted...

Question 5

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

Question 6

______________ 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 7

Interstellar dust scatters _____________light more than _____________light.

Accepted Answer

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

Question 8

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 9

H II emission nebula regions are found around _____________.

Accepted Answer

high tempe

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 _______________ is a high temperature, low density region in the interstellar medium around the Sun.

Accepted Answer

The answer of The _______________ is a high temperature, low...

Question 12

Why is the sky blue during the day?

Accepted Answer

The sky appears blue during th

Question 13

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 14

_______________ is believed to be produced by supernova explosions.

Accepted Answer

The answer of _______________ is believed to be produced by...

Question 15

Stars are born in reflection nebulae.

Accepted Answer

A) True 
 B)False

Question 16

The intercloud medium is believed to make up 90 percent of the mass of the interstellar medium.

Accepted Answer

A) True 
 B)False

Question 17

The interstellar reddening does not shift the _______________ of spectral lines, as does the Doppler effect.

Accepted Answer

The answer of The interstellar reddening does not shift the...

Question 18

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 19

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 20

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

Exam 10: The Interstellar Medium

The composition of the interstellar dust suggests that it is formed primarily in the atmospheres of cool stars.

Elements such as carbon, silicon and oxygen have been produced in stars and expelled as stars age in the interstellar medium. This is most likely due to these elements having cooled and condensed from aging stars to form dust grains, and carried out by a powerful winds.

Molecules in the interstellar medium emit radiation at what wavelengths?

The type of radiation that is emitted when the electron in a hydrogen atom experiences a spin flip is a (n) _______________.

H I clouds can be observed using _____.

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

Interstellar dust scatters _____________light more than _____________light.

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.

H II emission nebula regions are found around _____________.

Large molecular clouds will form into protostars because of ____.

The _______________ is a high temperature, low density region in the interstellar medium around the Sun.

Why is the sky blue during the day?

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?

_______________ is believed to be produced by supernova explosions.

Stars are born in reflection nebulae.

The intercloud medium is believed to make up 90 percent of the mass of the interstellar medium.

The interstellar reddening does not shift the _______________ of spectral lines, as does the Doppler effect.

Which mission passed the bow shock in the Universe?

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?

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.

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

Earth- the Active Planet

The Moon and Mercury

Venus and Mars

Jupiter and Saturn

Uranus, Neptune, Pluto, and the Kuiper Belt

Meteorites, Asteroids, and Comets

Astrobiology

Filters

Interstellar dust scatters _light more than _light.

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?