Question 1

According to recent models of supernovas,a massive star's envelope stops collapsing because:

Accepted Answer

A)  the strong nuclear force becomes repulsive. 
B)  neutrinos push the material outward. 
C)  jets from a gamma-ray burst push it outward. 
D)  high-energy gamma rays push it outward. 
A)  the strong nuclear force becomes repulsive. 
B)  neutrinos push the material outward. 
C)  jets from a gamma-ray burst push it outward. 
D)  high-energy gamma rays push it outward.

Question 2

How does a horizontal branch star produce energy?

Accepted Answer

A)  fusion of hydrogen in the core only 
B)  fusion of hydrogen in the core and helium in a shell 
C)  fusion of helium in the core only 
D)  fusion of helium in the core and hydrogen in a shell 
A)  fusion of hydrogen in the core only 
B)  fusion of hydrogen in the core and helium in a shell 
C)  fusion of helium in the core only 
D)  fusion of helium in the core and hydrogen in a shell

Question 3

What kind of star is shown in the figure below?

Accepted Answer

A)  main sequence 
B)  red giant 
C)  horizontal branch 
D)  asymptotic giant branch 
A)  main sequence 
B)  red giant 
C)  horizontal branch 
D)  asymptotic giant branch

Question 4

At the tip of the red giant branch,a star is half as hot as it was on the main sequence and 100 times larger.How does its luminosity compare to its value on the main sequence?

Accepted Answer

A)  It is now 10,000 times larger. 
B)  It is now 600 times larger. 
C)  It is now 16 times larger. 
D)  It is now 16 times smaller. 
A)  It is now 10,000 times larger. 
B)  It is now 600 times larger. 
C)  It is now 16 times larger. 
D)  It is now 16 times smaller.

Question 5

What kind of remnant will a 100 MSᵤn star leave?

Accepted Answer

A)  neutron star 
B)  white dwarf 
C)  black hole 
D)  Such a star does not leave a remnant. 
A)  neutron star 
B)  white dwarf 
C)  black hole 
D)  Such a star does not leave a remnant.

Question 6

In order from most to least common,what are the possible remnants of stars that run out of fuel for fusion?

Accepted Answer

A)  white dwarf, neutron star, black hole 
B)  white dwarf, black hole, neutron star 
C)  neutron star, white dwarf, black hole 
D)  neutron star, black hole, white dwarf 
A)  white dwarf, neutron star, black hole 
B)  white dwarf, black hole, neutron star 
C)  neutron star, white dwarf, black hole 
D)  neutron star, black hole, white dwarf

Question 7

What kind of astronomical object could form from the situation shown in the figure below?

Accepted Answer

A)  globular cluster 
B)  planetary nebula 
C)  supernova 
D)  Herbig-Haro objects 
A)  globular cluster 
B)  planetary nebula 
C)  supernova 
D)  Herbig-Haro objects

Question 8

A white dwarf is in a binary system with a red giant with five times the mass of the Sun.This system could result in a:

Accepted Answer

A)  gamma-ray burst. 
B)  Type II supernova. 
C)  Type Ia supernova. 
D)  none of the above. 
A)  gamma-ray burst. 
B)  Type II supernova. 
C)  Type Ia supernova. 
D)  none of the above.

Question 9

Why can massive stars fuse heavier elements than less massive stars?

Accepted Answer

Their stronger gravi

Question 10

Which of the following stellar endpoints has NOT been observed?

Accepted Answer

A)  a white dwarf from a 0.8 MSun star 
B)  a supernova from a 25 MSun star 
C)  a white dwarf from a 1 MSun star 
D)  a white dwarf from a 6 MSun star 
A)  a white dwarf from a 0.8 MSun star 
B)  a supernova from a 25 MSun star 
C)  a white dwarf from a 1 MSun star 
D)  a white dwarf from a 6 MSun star

Question 11

Astronomers detect a roughly spherical shock wave 50 light-years across in the plane of the Milky Way galaxy.This was most likely caused by:

Accepted Answer

A)  photoionization from a very massive star. 
B)  the death of a massive star. 
C)  the death of an intermediate mass star. 
D)  magnetized jets during star formation. 
A)  photoionization from a very massive star. 
B)  the death of a massive star. 
C)  the death of an intermediate mass star. 
D)  magnetized jets during star formation.

Question 12

Which of the following sets of measurements CANNOT be used to determine a main sequence star's eventual fate?

Accepted Answer

A)  mass 
B)  color and composition 
C)  luminosity and temperature 
D)  color, distance, and brightness 
A)  mass 
B)  color and composition 
C)  luminosity and temperature 
D)  color, distance, and brightness

Question 13

What are the resulting particles when protons and electrons are forced together in the core of a massive star during the early stages of a supernova?

Accepted Answer

A neutron

Question 14

How does a red giant's structure change as it becomes more luminous?

Accepted Answer

Its core contracts w

Question 15

Which of the following can most efficiently be used to measure the distance to a galaxy?

Accepted Answer

A)  Type Ia supernovas 
B)  gamma-ray bursts 
C)  Type II supernovas 
D)  novas 
A)  Type Ia supernovas 
B)  gamma-ray bursts 
C)  Type II supernovas 
D)  novas

Question 16

Which of the following factors helps explain why planetary nebula are NOT usually spherical?

Accepted Answer

A)  magnetic fields 
B)  accretion disk 
C)  binary companion 
D)  all of the above 
A)  magnetic fields 
B)  accretion disk 
C)  binary companion 
D)  all of the above

Question 17

Why does a red giant fuse hydrogen more rapidly than a main sequence star of the same mass?

Accepted Answer

A)  The star becomes more luminous. 
B)  The efficiency of energy generation decreases due to helium fusion. 
C)  The star's interior heats up. 
D)  The star becomes larger. 
A)  The star becomes more luminous. 
B)  The efficiency of energy generation decreases due to helium fusion. 
C)  The star's interior heats up. 
D)  The star becomes larger.

Question 18

Which of the following pairs of main sequence stars have different endpoints for their lives as stars?

Accepted Answer

A)  O and B stars 
B)  25 and 10 solar mass stars 
C)  10 and 5 solar mass stars 
D)  G and M stars 
A)  O and B stars 
B)  25 and 10 solar mass stars 
C)  10 and 5 solar mass stars 
D)  G and M stars

Question 19

Why do asymptotic giant branch stars have powerful winds?

Accepted Answer

A)  Dust forming in the star's envelope is opaque to its radiation. 
B)  Mass is lost during each of the star's pulsations. 
C)  The loss of fusion energy in the star's core means that the outer layers are no longer gravitationally bound. 
D)  The outer layers become too hot to be gravitationally bound. 
A)  Dust forming in the star's envelope is opaque to its radiation. 
B)  Mass is lost during each of the star's pulsations. 
C)  The loss of fusion energy in the star's core means that the outer layers are no longer gravitationally bound. 
D)  The outer layers become too hot to be gravitationally bound.

Question 20

As a star moves along the red giant branch,how does it move on the HR diagram?

Accepted Answer

A)  It does not move. 
B)  downward and to the left 
C)  upward and to the left 
D)  upward and to the right 
A)  It does not move. 
B)  downward and to the left 
C)  upward and to the left 
D)  upward and to the right

According to recent models of supernovas,a massive star's envelope stops collapsing because:

How does a horizontal branch star produce energy?

What kind of star is shown in the figure below?

At the tip of the red giant branch,a star is half as hot as it was on the main sequence and 100 times larger.How does its luminosity compare to its value on the main sequence?

What kind of remnant will a 100 MSᵤn star leave?

In order from most to least common,what are the possible remnants of stars that run out of fuel for fusion?

What kind of astronomical object could form from the situation shown in the figure below?

A white dwarf is in a binary system with a red giant with five times the mass of the Sun.This system could result in a:

Why can massive stars fuse heavier elements than less massive stars?

Which of the following stellar endpoints has NOT been observed?

Astronomers detect a roughly spherical shock wave 50 light-years across in the plane of the Milky Way galaxy.This was most likely caused by:

Which of the following sets of measurements CANNOT be used to determine a main sequence star's eventual fate?

What are the resulting particles when protons and electrons are forced together in the core of a massive star during the early stages of a supernova?

How does a red giant's structure change as it becomes more luminous?

Which of the following can most efficiently be used to measure the distance to a galaxy?

Which of the following factors helps explain why planetary nebula are NOT usually spherical?

Why does a red giant fuse hydrogen more rapidly than a main sequence star of the same mass?

Which of the following pairs of main sequence stars have different endpoints for their lives as stars?

Why do asymptotic giant branch stars have powerful winds?

As a star moves along the red giant branch,how does it move on the HR diagram?

Getting Started: Science, astronomy, and Being Human

A Universe Made, a Universe Discovered

A Universe of Universal Laws

A Universe of Universal Laws

The Architecture and Birth of Planetary Systems

Home Base: Earth and Moon

Sibling Worlds: Mercury, Venus, and Mars

Gas, ice, and Stone: the Outer Planets

Life and the Search for Habitable Worlds

The Sun As a Star

Measuring the Stars: the Main Sequence and Its Meaning

Nursery of the Stars: the Interstellar Medium and Star Formation

Down the Rabbit Hole: Relativity and Black Holes

Our City of Stars: the Milky Way

A Universe of Galaxies

The Cosmic Web: the Large-Scale Structure of the Universe

Cosmology

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Exam 13: To the Graveyard of Stars: the End Points of Stellar Evolution

According to recent models of supernovas,a massive star's envelope stops collapsing because:

How does a horizontal branch star produce energy?

What kind of star is shown in the figure below?

At the tip of the red giant branch,a star is half as hot as it was on the main sequence and 100 times larger.How does its luminosity compare to its value on the main sequence?

What kind of remnant will a 100 MSᵤn star leave?

In order from most to least common,what are the possible remnants of stars that run out of fuel for fusion?

What kind of astronomical object could form from the situation shown in the figure below?

A white dwarf is in a binary system with a red giant with five times the mass of the Sun.This system could result in a:

Why can massive stars fuse heavier elements than less massive stars?

Which of the following stellar endpoints has NOT been observed?

Astronomers detect a roughly spherical shock wave 50 light-years across in the plane of the Milky Way galaxy.This was most likely caused by:

Which of the following sets of measurements CANNOT be used to determine a main sequence star's eventual fate?

What are the resulting particles when protons and electrons are forced together in the core of a massive star during the early stages of a supernova?

How does a red giant's structure change as it becomes more luminous?

Which of the following can most efficiently be used to measure the distance to a galaxy?

Which of the following factors helps explain why planetary nebula are NOT usually spherical?

Why does a red giant fuse hydrogen more rapidly than a main sequence star of the same mass?

Which of the following pairs of main sequence stars have different endpoints for their lives as stars?

Why do asymptotic giant branch stars have powerful winds?

As a star moves along the red giant branch,how does it move on the HR diagram?

Getting Started: Science, astronomy, and Being Human

A Universe Made, a Universe Discovered

A Universe of Universal Laws

A Universe of Universal Laws

The Architecture and Birth of Planetary Systems

Home Base: Earth and Moon

Sibling Worlds: Mercury, Venus, and Mars

Gas, ice, and Stone: the Outer Planets

Life and the Search for Habitable Worlds

The Sun As a Star

Measuring the Stars: the Main Sequence and Its Meaning

Nursery of the Stars: the Interstellar Medium and Star Formation

Down the Rabbit Hole: Relativity and Black Holes

Our City of Stars: the Milky Way

A Universe of Galaxies

The Cosmic Web: the Large-Scale Structure of the Universe

Cosmology

Filters