Question 1

What evidence indicates protostars have formed?

Accepted Answer

A)  jets 
B)  bipolar outflows 
C)  protostellar disks 
D)  All of the other choices are correct. 
A)  jets 
B)  bipolar outflows 
C)  protostellar disks 
D)  All of the other choices are correct.

Question 2

The law of ________________ states that energy must flow from _________ temperature regions to __________ temperature regions.

Accepted Answer

energy tra

Question 3

Opacity is

Accepted Answer

A)  the balance between the pressure and force of gravity inside a star. 
B)  the force that binds protons and neutrons together to form a nucleus. 
C)  the force that binds an electron to the nucleus in an atom. 
D)  a measure of the resistance to the flow of radiation (photons) through a gas. 
E)  the temperature and density at which a gas will undergo thermonuclear fusion. 
A)  the balance between the pressure and force of gravity inside a star. 
B)  the force that binds protons and neutrons together to form a nucleus. 
C)  the force that binds an electron to the nucleus in an atom. 
D)  a measure of the resistance to the flow of radiation (photons) through a gas. 
E)  the temperature and density at which a gas will undergo thermonuclear fusion.

Question 4

The image on the right indicates star formation that we cannot see in the wavelength band on the left. The image on the left is a/an __________ wavelength image of the ___________ wavelength image on the right.

Accepted Answer

A)  radio, infrared 
B)  infrared, visual 
C)  visual, infrared 
D)  infrared, radio 
A)  radio, infrared 
B)  infrared, visual 
C)  visual, infrared 
D)  infrared, radio

Question 5

What characteristic of a star primarily determines its location on the main sequence?

Accepted Answer

A)  age 
B)  distance from the galactic center 
C)  mass 
D)  space motion 
E)  radius 
A)  age 
B)  distance from the galactic center 
C)  mass 
D)  space motion 
E)  radius

Question 6

Stars are born in

Accepted Answer

A)  reflection nebulae. 
B)  dense molecular clouds. 
C)  HII regions. 
D)  the intercloud medium. 
E)  the local bubble. 
A)  reflection nebulae. 
B)  dense molecular clouds. 
C)  HII regions. 
D)  the intercloud medium. 
E)  the local bubble.

Question 7

The above image is an example of a/an ____________.

Accepted Answer

A)  cluster of stars producing reflection nebula 
B)  T association 
C)  OB association 
D)  Trapezium cluster 
A)  cluster of stars producing reflection nebula 
B)  T association 
C)  OB association 
D)  Trapezium cluster

Question 8

While on the main sequence a star's primary energy source comes from

Accepted Answer

A)  nuclear fusion. 
B)  nuclear fission. 
C)  gravitational potential energy. 
D)  magnetic fields. 
A)  nuclear fusion. 
B)  nuclear fission. 
C)  gravitational potential energy. 
D)  magnetic fields.

Question 9

Both the CNO cycle and the proton-proton fusion chain convert hydrogen to helium using catalysts.

Accepted Answer

A) True 
 B)False

Question 10

What must occur for an object to be considered a main-sequence star?

Accepted Answer

A)  hydrostatic equilibrium 
B)  nuclear fusion reaction in the core 
C)  protostar life begins 
D)  hydrostatic equilibrium and nuclear fusion reaction in the core 
A)  hydrostatic equilibrium 
B)  nuclear fusion reaction in the core 
C)  protostar life begins 
D)  hydrostatic equilibrium and nuclear fusion reaction in the core

Question 11

Why do nuclear fusion reactions only take place in the interior of a star?

Accepted Answer

A)  The magnetic fields are strongest there. 
B)  The temperature is the hottest in the center. 
C)  The density of material is very high in the center. 
D)  The temperature is the hottest in the center and the density of material is very high in the center. 
E)  FALSE; Nuclear fusion reactions can take place in the core and corona where temperatures are high enough. 
A)  The magnetic fields are strongest there. 
B)  The temperature is the hottest in the center. 
C)  The density of material is very high in the center. 
D)  The temperature is the hottest in the center and the density of material is very high in the center. 
E)  FALSE; Nuclear fusion reactions can take place in the core and corona where temperatures are high enough.

Question 12

In the above cartoon of the Orion constellation, the upper red supergiant star is known as Rigel and the lower right supergiant star is known as Betelgeuse.

Accepted Answer

A) True 
 B)False

Question 13

Hydrostatic equilibrium refers to the balance between weight and pressure.

Accepted Answer

A) True 
 B)False

Question 14

Absorption lines due to the interstellar medium indicate that some components of the interstellar medium are cold and of a very low density because

Accepted Answer

A)  the lines are blue shifted. 
B)  the lines are red shifted. 
C)  the lines are extremely broad. 
D)  the lines are extremely narrow. 
E)  the lines are much darker than the stellar lines. 
A)  the lines are blue shifted. 
B)  the lines are red shifted. 
C)  the lines are extremely broad. 
D)  the lines are extremely narrow. 
E)  the lines are much darker than the stellar lines.

Question 15

The visual pink glow of the Great Nebula in Orion

Accepted Answer

A)  is a Herbig-Haro object. 
B)  is a reflection nebula of dust. 
C)  is an emission nebula of thin gas. 
D)  contains only young low mass stars. 
E)  is believed to be about 5 billion years old. 
A)  is a Herbig-Haro object. 
B)  is a reflection nebula of dust. 
C)  is an emission nebula of thin gas. 
D)  contains only young low mass stars. 
E)  is believed to be about 5 billion years old.

Question 16

The above image is an example of a ________.

Accepted Answer

A)  protostellar disk 
B)  YSO 
C)  protostar 
D)  Herbig-Haro object 
A)  protostellar disk 
B)  YSO 
C)  protostar 
D)  Herbig-Haro object

What evidence indicates protostars have formed?

The law of ____________ states that energy must flow from _ temperature regions to ______ temperature regions.

Opacity is

The image on the right indicates star formation that we cannot see in the wavelength band on the left. The image on the left is a/an wavelength image of the _ wavelength image on the right.

What characteristic of a star primarily determines its location on the main sequence?

Stars are born in

The above image is an example of a/an ____________.

While on the main sequence a star's primary energy source comes from

Both the CNO cycle and the proton-proton fusion chain convert hydrogen to helium using catalysts.

What must occur for an object to be considered a main-sequence star?

Why do nuclear fusion reactions only take place in the interior of a star?

In the above cartoon of the Orion constellation, the upper red supergiant star is known as Rigel and the lower right supergiant star is known as Betelgeuse.

Hydrostatic equilibrium refers to the balance between weight and pressure.

Absorption lines due to the interstellar medium indicate that some components of the interstellar medium are cold and of a very low density because

The visual pink glow of the Great Nebula in Orion

The above image is an example of a ________.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Exam 9: The Formation and Structure of Stars

What evidence indicates protostars have formed?

The law of ________________ states that energy must flow from _________ temperature regions to __________ temperature regions.

Opacity is

The image on the right indicates star formation that we cannot see in the wavelength band on the left. The image on the left is a/an __________ wavelength image of the ___________ wavelength image on the right.

What characteristic of a star primarily determines its location on the main sequence?

Stars are born in

The above image is an example of a/an ____________.

While on the main sequence a star's primary energy source comes from

Both the CNO cycle and the proton-proton fusion chain convert hydrogen to helium using catalysts.

What must occur for an object to be considered a main-sequence star?

Why do nuclear fusion reactions only take place in the interior of a star?

In the above cartoon of the Orion constellation, the upper red supergiant star is known as Rigel and the lower right supergiant star is known as Betelgeuse.

Hydrostatic equilibrium refers to the balance between weight and pressure.

Absorption lines due to the interstellar medium indicate that some components of the interstellar medium are cold and of a very low density because

The visual pink glow of the Great Nebula in Orion

The above image is an example of a ________.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

The law of ____________ states that energy must flow from _ temperature regions to ______ temperature regions.

The image on the right indicates star formation that we cannot see in the wavelength band on the left. The image on the left is a/an wavelength image of the _ wavelength image on the right.