Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

Because they are composed of ionized hydrogen, emission nebulae have another name - what is that name?

Accepted Answer

A)  HI regions 
B)  HII regions 
C)  Bok globules 
D)  HeI regions 
A)  HI regions 
B)  HII regions 
C)  Bok globules 
D)  HeI regions

Question 3

What does the time a protostar takes to contract from a cool interstellar gas cloud to a main-sequence star mainly depend on?

Accepted Answer

A)  luminosity 
B)  mass 
C)  magnetic field 
D)  location on the main sequence 
A)  luminosity 
B)  mass 
C)  magnetic field 
D)  location on the main sequence

Question 4

What is produced in the proton-proton chain?

Accepted Answer

A)  two hydrogen nuclei, a single helium nucleus, and energy in the form of visible light 
B)  four hydrogen nuclei and energy in the form of gamma rays 
C)  a helium nucleus and energy in the form of gamma rays 
D)  two hydrogen nuclei and energy in the form of visible light 
A)  two hydrogen nuclei, a single helium nucleus, and energy in the form of visible light 
B)  four hydrogen nuclei and energy in the form of gamma rays 
C)  a helium nucleus and energy in the form of gamma rays 
D)  two hydrogen nuclei and energy in the form of visible light

Question 5

____________________ appear reddish or pink in colour due to the light emitted by the Balmer series of the hydrogen atom.

Accepted Answer

Emission n

Question 6

The Sun makes most of its energy by the CNO cycle.

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

-Which of the following statements is true?

Accepted Answer

A)  Low mass stars consume fuel rapidly. 
B)  Massive stars consume fuel rapidly. 
C)  Red giants are hotter than very massive stars. 
D)  White dwarfs are readily visible by naked eye. 
A)  Low mass stars consume fuel rapidly. 
B)  Massive stars consume fuel rapidly. 
C)  Red giants are hotter than very massive stars. 
D)  White dwarfs are readily visible by naked eye.

Question 9

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

Accepted Answer

temperatur

Question 10

You observe several massive stars within a cool nebula. Which of the following is the most likely explanation?

Accepted Answer

A)  The massive stars ejected some of their mass to form the nebula. 
B)  The massive stars formed within the nebula. 
C)  The massive stars are flying through the nebula. 
D)  The massive stars have reduced the temperature of the nebula's gas. 
A)  The massive stars ejected some of their mass to form the nebula. 
B)  The massive stars formed within the nebula. 
C)  The massive stars are flying through the nebula. 
D)  The massive stars have reduced the temperature of the nebula's gas.

Question 11

Star clusters are important to the study of stellar evolution because all the stars in a given cluster have one thing in common. What is it?

Accepted Answer

A)  temperature 
B)  mass 
C)  age 
D)  luminosity 
A)  temperature 
B)  mass 
C)  age 
D)  luminosity

Question 12

Stars with masses greater than 1.1 solar masses use the ____________________ to convert hydrogen into helium and produce energy

Accepted Answer

The answer of Stars with masses greater than 1.1 solar...

Question 13

Why is the presence of massive stars in the Orion Nebula an indication that star formation is currently occurring?

Accepted Answer

A)  The Orion Nebula contains large amounts of gas and dust. 
B)  Massive stars have short lives, so they must have formed recently. 
C)  Massive stars trigger star formation in nearby gas clouds. 
D)  The Orion Nebula contains large numbers of brown dwarfs and supernova remnants. 
A)  The Orion Nebula contains large amounts of gas and dust. 
B)  Massive stars have short lives, so they must have formed recently. 
C)  Massive stars trigger star formation in nearby gas clouds. 
D)  The Orion Nebula contains large numbers of brown dwarfs and supernova remnants.

Question 14

-On the H-R diagram, the line indicates the location of the main sequence. Which of the four labelled locations on the H-R diagram indicates a luminosity and temperature similar to that of a T Tauri star?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 15

In which option below are the stellar types sorted from shortest to longest main-sequence lifetime?

Accepted Answer

A)  O, A, K, M 
B)  A, B, F, G 
C)  K, F, B, O 
D)  B, A, M, G 
A)  O, A, K, M 
B)  A, B, F, G 
C)  K, F, B, O 
D)  B, A, M, G

Question 16

Which of the following are small luminous nebulae excited by the jets of nearby protostars?

Accepted Answer

A)  T Tauri stars 
B)  Bok globules 
C)  O associations 
D)  Herbig-Haro objects 
A)  T Tauri stars 
B)  Bok globules 
C)  O associations 
D)  Herbig-Haro objects

Question 17

In which part of the electromagnetic spectrum do interstellar dust grains emit the most light?

Accepted Answer

A)  radio 
B)  infrared 
C)  visible 
D)  UV 
A)  radio 
B)  infrared 
C)  visible 
D)  UV

Question 18

What can initiate the free-fall contraction of a molecular cloud?

Accepted Answer

A)  shock waves from supernovae 
B)  nearby spectral type G stars 
C)  the rotation of the cloud 
D)  the cloud becoming transparent to ultraviolet radiation 
A)  shock waves from supernovae 
B)  nearby spectral type G stars 
C)  the rotation of the cloud 
D)  the cloud becoming transparent to ultraviolet radiation

Question 19

T Tauri stars are believed to be young, high mass, main-sequence stars.

Accepted Answer

A) True 
 B)False

Question 20

Consider two stars of the same mass: star 1 has just moved on to the main sequence, and star 2 is about to leave it. How are these two stars different?

Accepted Answer

A)  Star 2 has more helium in its core and a hotter surface. 
B)  Star 2 has more helium in its core and a cooler surface. 
C)  Star 1 is more luminous and has a hotter surface. 
D)  Star 1 is more luminous and has a cooler surface. 
A)  Star 2 has more helium in its core and a hotter surface. 
B)  Star 2 has more helium in its core and a cooler surface. 
C)  Star 1 is more luminous and has a hotter surface. 
D)  Star 1 is more luminous and has a cooler surface.

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

Because they are composed of ionized hydrogen, emission nebulae have another name - what is that name?

What does the time a protostar takes to contract from a cool interstellar gas cloud to a main-sequence star mainly depend on?

What is produced in the proton-proton chain?

____________________ appear reddish or pink in colour due to the light emitted by the Balmer series of the hydrogen atom.

The Sun makes most of its energy by the CNO cycle.

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

-Which of the following statements is true?

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

You observe several massive stars within a cool nebula. Which of the following is the most likely explanation?

Star clusters are important to the study of stellar evolution because all the stars in a given cluster have one thing in common. What is it?

Stars with masses greater than 1.1 solar masses use the ____________________ to convert hydrogen into helium and produce energy

Why is the presence of massive stars in the Orion Nebula an indication that star formation is currently occurring?

-On the H-R diagram, the line indicates the location of the main sequence. Which of the four labelled locations on the H-R diagram indicates a luminosity and temperature similar to that of a T Tauri star?

In which option below are the stellar types sorted from shortest to longest main-sequence lifetime?

Which of the following are small luminous nebulae excited by the jets of nearby protostars?

In which part of the electromagnetic spectrum do interstellar dust grains emit the most light?

What can initiate the free-fall contraction of a molecular cloud?

T Tauri stars are believed to be young, high mass, main-sequence stars.

Consider two stars of the same mass: star 1 has just moved on to the main sequence, and star 2 is about to leave it. How are these two stars different?

The Scale of the Cosmos: Space and Time

Users Guide to the Sky: Patterns and Cycles

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments: Extending Humanitys Vision

The Sun: the Closest Star

The Family of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

Planet Formation and Exoplanets

Comparative Planetology of the Terrestrial Planets

The Outer Solar System

Life on Other Worlds

Filters

Exam 7: The Structure and Formation of Stars

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

Because they are composed of ionized hydrogen, emission nebulae have another name - what is that name?

What does the time a protostar takes to contract from a cool interstellar gas cloud to a main-sequence star mainly depend on?

What is produced in the proton-proton chain?

____________________ appear reddish or pink in colour due to the light emitted by the Balmer series of the hydrogen atom.

The Sun makes most of its energy by the CNO cycle.

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

-Which of the following statements is true?

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

You observe several massive stars within a cool nebula. Which of the following is the most likely explanation?

Star clusters are important to the study of stellar evolution because all the stars in a given cluster have one thing in common. What is it?

Stars with masses greater than 1.1 solar masses use the ____________________ to convert hydrogen into helium and produce energy

Why is the presence of massive stars in the Orion Nebula an indication that star formation is currently occurring?

-On the H-R diagram, the line indicates the location of the main sequence. Which of the four labelled locations on the H-R diagram indicates a luminosity and temperature similar to that of a T Tauri star?

In which option below are the stellar types sorted from shortest to longest main-sequence lifetime?

Which of the following are small luminous nebulae excited by the jets of nearby protostars?

In which part of the electromagnetic spectrum do interstellar dust grains emit the most light?

What can initiate the free-fall contraction of a molecular cloud?

T Tauri stars are believed to be young, high mass, main-sequence stars.

Consider two stars of the same mass: star 1 has just moved on to the main sequence, and star 2 is about to leave it. How are these two stars different?

The Scale of the Cosmos: Space and Time

Users Guide to the Sky: Patterns and Cycles

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments: Extending Humanitys Vision

The Sun: the Closest Star

The Family of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

Planet Formation and Exoplanets

Comparative Planetology of the Terrestrial Planets

The Outer Solar System

Life on Other Worlds

Filters

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