Question 1

The helium flash is the cause of some supernovae.

Accepted Answer

A) True 
 B)False

Question 2

As a main-sequence star exhausts hydrogen in its core, its surface becomes___ and its energy output per second (luminosity) becomes ____

Accepted Answer

A)  hotter; larger 
B)  cooler; larger 
C)  hotter; smaller 
D)  cooler; smaller 
A)  hotter; larger 
B)  cooler; larger 
C)  hotter; smaller 
D)  cooler; smaller

Question 3

Because more massive stars have more gravitational energy, they can fuse heavier nuclear fuels.

Accepted Answer

A) True 
 B)False

Question 4

The theory that the collapse of a massive star's iron core produces neutrinos was supported by

Accepted Answer

A)  the size and structure of the Crab nebula. 
B)  laboratory measurements of the mass of the neutrino. 
C)  the brightening of supernovae a few days after they are first visible. 
D)  underground counts from solar neutrinos. 
E)  the detection of neutrinos from the supernova of 1987. 
A)  the size and structure of the Crab nebula. 
B)  laboratory measurements of the mass of the neutrino. 
C)  the brightening of supernovae a few days after they are first visible. 
D)  underground counts from solar neutrinos. 
E)  the detection of neutrinos from the supernova of 1987.

Question 5

Synchrotron radiation is produced

Accepted Answer

A)  in planetary nebulae. 
B)  by red dwarfs. 
C)  in massive stars as their iron core collapses. 
D)  in supernova remnants. 
E)  by neutrinos. 
A)  in planetary nebulae. 
B)  by red dwarfs. 
C)  in massive stars as their iron core collapses. 
D)  in supernova remnants. 
E)  by neutrinos.

Question 6

A planetary nebula is

Accepted Answer

A)  the expelled outer envelope of a medium-mass star. 
B)  produced by a supernova explosion. 
C)  produced by a nova explosion. 
D)  a nebula within which planets are forming. 
E)  a cloud of hot gas surrounding a planet. 
A)  the expelled outer envelope of a medium-mass star. 
B)  produced by a supernova explosion. 
C)  produced by a nova explosion. 
D)  a nebula within which planets are forming. 
E)  a cloud of hot gas surrounding a planet.

Question 7

The average size of a white dwarf is about the same size as the Earth.

Accepted Answer

A) True 
 B)False

Question 8

A main-sequence star of 8.5 solar masses can become a white dwarf by

Accepted Answer

A)  exceeding the Chandrasekhar limit. 
B)  losing mass. 
C)  gaining mass. 
D)  remaining at 8.5 solar masses. 
A)  exceeding the Chandrasekhar limit. 
B)  losing mass. 
C)  gaining mass. 
D)  remaining at 8.5 solar masses.

Question 9

Explain how we can find the age of a star cluster.

Accepted Answer

The answer of Explain how we can find the age...

Question 10

Helium fusion does not begin until the star has entered the giant region of the H-R diagram.

Accepted Answer

A) True 
 B)False

Question 11

The image shows the Crab Nebula. The Crab Nebula is

Accepted Answer

A)  a planetary nebula. 
B)  a name for the cloud of gas and dust which later became our solar system. 
C)  an ejected cloud of gas from a supernova. 
D)  in the constellation Orion, containing many bright young blue stars. 
A)  a planetary nebula. 
B)  a name for the cloud of gas and dust which later became our solar system. 
C)  an ejected cloud of gas from a supernova. 
D)  in the constellation Orion, containing many bright young blue stars.

Question 12

Giant and supergiant stars are rare because that stage of stellar evolution is short.

Accepted Answer

A) True 
 B)False

Question 13

Why can't a massive star generate energy through iron fusion?

Accepted Answer

The answer of Why can't a massive star generate energy...

Question 14

Even the youngest star clusters have no stars still contracting toward the main sequence.

Accepted Answer

A) True 
 B)False

Question 15

After what evolutionary stage does a star become a white dwarf?

Accepted Answer

A)  protostar 
B)  pre-main sequence 
C)  main sequence 
D)  giant 
A)  protostar 
B)  pre-main sequence 
C)  main sequence 
D)  giant

Question 16

Star clusters are important to our study of stars because

Accepted Answer

A)  all stars formed in star clusters. 
B)  the sun was once a member of a globular cluster. 
C)  they give us a method to test the our theories and models of stellar evolution. 
D)  they are the only objects that contain Cepheid variables. 
E)  all of the above. 
A)  all stars formed in star clusters. 
B)  the sun was once a member of a globular cluster. 
C)  they give us a method to test the our theories and models of stellar evolution. 
D)  they are the only objects that contain Cepheid variables. 
E)  all of the above.

Question 17

A Type II supernova produces a planetary nebula.

Accepted Answer

A) True 
 B)False

Question 18

Planetary nebulae are sites of planet formation.

Accepted Answer

A) True 
 B)False

Question 19

Stars in a star cluster

Accepted Answer

A)  all have the same age. 
B)  all have the same chemical composition. 
C)  all have the same luminosity. 
D)  all of the above. 
E)  a and b above. 
A)  all have the same age. 
B)  all have the same chemical composition. 
C)  all have the same luminosity. 
D)  all of the above. 
E)  a and b above.

Question 20

An accretion disk can grow hot enough to radiate X-rays.

Accepted Answer

A) True 
 B)False

The helium flash is the cause of some supernovae.

As a main-sequence star exhausts hydrogen in its core, its surface becomes_ and its energy output per second (luminosity) becomes __

Because more massive stars have more gravitational energy, they can fuse heavier nuclear fuels.

The theory that the collapse of a massive star's iron core produces neutrinos was supported by

Synchrotron radiation is produced

A planetary nebula is

The average size of a white dwarf is about the same size as the Earth.

A main-sequence star of 8.5 solar masses can become a white dwarf by

Explain how we can find the age of a star cluster.

Helium fusion does not begin until the star has entered the giant region of the H-R diagram.

The image shows the Crab Nebula. The Crab Nebula is

Giant and supergiant stars are rare because that stage of stellar evolution is short.

Why can't a massive star generate energy through iron fusion?

Even the youngest star clusters have no stars still contracting toward the main sequence.

After what evolutionary stage does a star become a white dwarf?

Star clusters are important to our study of stars because

A Type II supernova produces a planetary nebula.

Planetary nebulae are sites of planet formation.

Stars in a star cluster

An accretion disk can grow hot enough to radiate X-rays.

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 Formation and Structure 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

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Exam 10: The Deaths of Stars

The helium flash is the cause of some supernovae.

As a main-sequence star exhausts hydrogen in its core, its surface becomes___ and its energy output per second (luminosity) becomes ____

Because more massive stars have more gravitational energy, they can fuse heavier nuclear fuels.

The theory that the collapse of a massive star's iron core produces neutrinos was supported by

Synchrotron radiation is produced

A planetary nebula is

The average size of a white dwarf is about the same size as the Earth.

A main-sequence star of 8.5 solar masses can become a white dwarf by

Explain how we can find the age of a star cluster.

Helium fusion does not begin until the star has entered the giant region of the H-R diagram.

The image shows the Crab Nebula. The Crab Nebula is

Giant and supergiant stars are rare because that stage of stellar evolution is short.

Why can't a massive star generate energy through iron fusion?

Even the youngest star clusters have no stars still contracting toward the main sequence.

After what evolutionary stage does a star become a white dwarf?

Star clusters are important to our study of stars because

A Type II supernova produces a planetary nebula.

Planetary nebulae are sites of planet formation.

Stars in a star cluster

An accretion disk can grow hot enough to radiate X-rays.

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 Formation and Structure 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

As a main-sequence star exhausts hydrogen in its core, its surface becomes_ and its energy output per second (luminosity) becomes __