Question 1

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 2

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

Accepted Answer

wavelength

Question 3

The ground state of hydrogen has two closely-spaced energy levels, where oneelectron is spinning up and the other is spinning down. This energy transition corresponds to releasing excess energy as a photon at what wavelength?

Accepted Answer

A)  21 centimeters 
B)  21 millimeters 
C)  21 meters 
D)  22.2 centimeters 
E)  22.2 millimeters 
A)  21 centimeters 
B)  21 millimeters 
C)  21 meters 
D)  22.2 centimeters 
E)  22.2 millimeters A

Question 4

To an observer on Earth, dust in the interstellar medium will cause a star to appear _______________ and_______________than it really is.

Accepted Answer

fainter; c

Question 5

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 6

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 7

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 8

What is the most abundant element in the interstellar medium?

Accepted Answer

A)  carbon 
B)  iron dust 
C)  carbon dust 
D)  helium 
E)  hydrogen 
A)  carbon 
B)  iron dust 
C)  carbon dust 
D)  helium 
E)  hydrogen

Question 9

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 10

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 11

H II Regions are also called emission nebulae.

Accepted Answer

A) True 
 B)False

Question 12

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 13

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 14

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 15

Interstellar dust scatters _____________light more than _____________light.

Accepted Answer

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

Question 16

Briefly discuss the gas-stars-gas cycle.

Accepted Answer

During a star's lifetime, it fuses hydro

Question 17

What produces the coronal gas?

Accepted Answer

1 Astronomers have evidence that most co

Question 18

Match between columns
                        Premises: Highly ionized state
The coolest temperature
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
A chaotic shape that is usually twisted, flattened, and tangled
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
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
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

Accepted Answer

The Answer of Intercloud medium and Molecular clouds and H is...

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

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

Exam 10: The Interstellar Medium

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

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

The ground state of hydrogen has two closely-spaced energy levels, where oneelectron is spinning up and the other is spinning down. This energy transition corresponds to releasing excess energy as a photon at what wavelength?

To an observer on Earth, dust in the interstellar medium will cause a star to appear _______________ and_______________than it really is.

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

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

What is the most abundant element in the interstellar medium?

Which mission is mapping the heliosphere's boundary?

Molecules in the interstellar medium emit radiation at what wavelengths?

H II Regions are also called emission nebulae.

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

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

H I clouds can be observed using _____.

Interstellar dust scatters _____________light more than _____________light.

Briefly discuss the gas-stars-gas cycle.

What produces the coronal gas?

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

Which mission passed the bow shock in the Universe?

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

Origin of the Solar System and Extrasolar Planets

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

To an observer on Earth, dust in the interstellar medium will cause a star to appear _ and_than it really is.

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

Interstellar dust scatters _light more than _light.