Question 1

The Sun makes most of its energy by the proton-proton cycle.

Accepted Answer

A) True 
 B)False  True

Question 2

Ionization from the ____________________ star in the Orion nebula makes it ____________________ brightly.

Accepted Answer

hottest; glow

Question 3

To initiate star formation in a cloud, you need a __________.

Accepted Answer

A) slow contraction of a molecular cloud 
B) rotating molecular cloud 
C) magnetic field 
D) shock 
A) slow contraction of a molecular cloud 
B) rotating molecular cloud 
C) magnetic field 
D) shock D

Question 4

Why are distant stars redder than nearby stars of the same spectral type

Accepted Answer

Interstellar reddening makes s

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

___________ associations and ___________ associations are groups of stars born together but not gravitationally bound to one another.

Accepted Answer

The answer of ___________ associations and ___________ associations are groups...

Question 7

The condition of ____________________ means that the force due to gravity pushing down on a layer is exactly equal to the pressure pushing outward on that layer.

Accepted Answer

hydrostati

Question 8

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 9

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 10

The average star spends ________ of its lifetime on the main sequence.

Accepted Answer

A) 1% 
B) 2% 
C) 10% 
D) 20% 
E) 90% 
A) 1% 
B) 2% 
C) 10% 
D) 20% 
E) 90%

Question 11

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 12

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

Accepted Answer

energy tra

Question 13

in the following image, the blue color is from a/an ____________ nebula whereas the pink color is from a/an ___________ nebula.

Accepted Answer

A) dark, reflection 
B) reflection, emission 
C) emission, dark 
D) emission, reflection 
A) dark, reflection 
B) reflection, emission 
C) emission, dark 
D) emission, reflection

Question 14

Which of the following energy transport processes involves mass motions of material

Accepted Answer

A) radiation 
B) conduction 
C) convection 
D) All of the other choices are correct. 
A) radiation 
B) conduction 
C) convection 
D) All of the other choices are correct.

Question 15

YSOs are in hydrostatic equilibrium.

Accepted Answer

A) True 
 B)False

Question 16

-In the Herbig-Haro object shown above, the Herbig-Haro is the ___________.

Accepted Answer

A) red jet 
B) white/blue colored interstellar medium the red jet runs into 
C) dusty disk containing a newborn star and the red jet 
D) All of these choices are correct. 
A) red jet 
B) white/blue colored interstellar medium the red jet runs into 
C) dusty disk containing a newborn star and the red jet 
D) All of these choices are correct.

Question 17

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 18

Some young star clusters contain large numbers of T Tauri stars.

Accepted Answer

A) True 
 B)False

Question 19

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 20

The pressure of an interstellar gas cloud depends on the cloud's ____________________ and ____________________.

Accepted Answer

temperatur

The Sun makes most of its energy by the proton-proton cycle.

Ionization from the star in the Orion nebula makes it brightly.

To initiate star formation in a cloud, you need a __________.

Why are distant stars redder than nearby stars of the same spectral type

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

_ associations and _ associations are groups of stars born together but not gravitationally bound to one another.

The condition of ____________________ means that the force due to gravity pushing down on a layer is exactly equal to the pressure pushing outward on that layer.

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

Stars are born in

The average star spends ________ of its lifetime on the main sequence.

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

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

in the following image, the blue color is from a/an __ nebula whereas the pink color is from a/an _ nebula.

Which of the following energy transport processes involves mass motions of material

YSOs are in hydrostatic equilibrium.

-In the Herbig-Haro object shown above, the Herbig-Haro is the ___________.

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

Some young star clusters contain large numbers of T Tauri stars.

The visual pink glow of the Great Nebula in Orion

The pressure of an interstellar gas cloud depends on the cloud's and .

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

The Origin of the Solar System

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

The Sun makes most of its energy by the proton-proton cycle.

Ionization from the ____________________ star in the Orion nebula makes it ____________________ brightly.

To initiate star formation in a cloud, you need a __________.

Why are distant stars redder than nearby stars of the same spectral type

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

___________ associations and ___________ associations are groups of stars born together but not gravitationally bound to one another.

The condition of ____________________ means that the force due to gravity pushing down on a layer is exactly equal to the pressure pushing outward on that layer.

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

Stars are born in

The average star spends ________ of its lifetime on the main sequence.

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

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

in the following image, the blue color is from a/an ____________ nebula whereas the pink color is from a/an ___________ nebula.

Which of the following energy transport processes involves mass motions of material

YSOs are in hydrostatic equilibrium.

-In the Herbig-Haro object shown above, the Herbig-Haro is the ___________.

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

Some young star clusters contain large numbers of T Tauri stars.

The visual pink glow of the Great Nebula in Orion

The pressure of an interstellar gas cloud depends on the cloud's ____________________ and ____________________.

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

The Origin of the Solar System

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

Ionization from the star in the Orion nebula makes it brightly.

_ associations and _ associations are groups of stars born together but not gravitationally bound to one another.

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

in the following image, the blue color is from a/an __ nebula whereas the pink color is from a/an _ nebula.

The pressure of an interstellar gas cloud depends on the cloud's and .