Question 1

Once a star ejects a planetary nebula, it becomes a white dwarf.

Accepted Answer

A) True 
 B)False  True

Question 2

​
In the visual wavelength image, a/an ______________ cluster is shown.

Accepted Answer

A)  open 
B)  globular 
C)  Trapezium 
D)  Helix nebula 
A)  open 
B)  globular 
C)  Trapezium 
D)  Helix nebula B

Question 3

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

Accepted Answer

A) True 
 B)False  True

Question 4

Stars that have ejected a planetary nebula eventually become

Accepted Answer

A)  protostars. 
B)  brown dwarfs. 
C)  white dwarfs. 
D)  red giants. 
A)  protostars. 
B)  brown dwarfs. 
C)  white dwarfs. 
D)  red giants.

Question 5

The triple-alpha process involves the fusion of

Accepted Answer

A)  three alpha particles. 
B)  three neutral helium atoms. 
C)  three alpha particles or three neutral helium atoms. 
D)  None of the other choices are correct. 
A)  three alpha particles. 
B)  three neutral helium atoms. 
C)  three alpha particles or three neutral helium atoms. 
D)  None of the other choices are correct.

Question 6

The Chandrasekhar limit tells us that

Accepted Answer

A)  accretion disks can grow hot through friction. 
B)  neutron stars of more than 3 solar masses are not stable. 
C)  white dwarfs more massive than 1.4 solar masses are not stable. 
D)  stars cannot travel through space too fast. 
E)  stars with a mass less than 0.5 solar masses will not go through helium flash. 
A)  accretion disks can grow hot through friction. 
B)  neutron stars of more than 3 solar masses are not stable. 
C)  white dwarfs more massive than 1.4 solar masses are not stable. 
D)  stars cannot travel through space too fast. 
E)  stars with a mass less than 0.5 solar masses will not go through helium flash.

Question 7

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

Question 8

If the Sun and stars are supported by gas pressure, what supports a white dwarf?

Accepted Answer

The answer of If the Sun and stars are supported...

Question 9

A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/s. What is the approximate age of this planetary nebula? (1 pc is equal to 3 × 1013 km and 1 year is equal to 3.15 × 107 seconds.)

Accepted Answer

A)  240 years 
B)  790,000 years 
C)  96,000 years 
D)  960 years 
E)  24,000 years 
A)  240 years 
B)  790,000 years 
C)  96,000 years 
D)  960 years 
E)  24,000 years

Question 10

Stars less massive than 0.4 solar mass never become giant stars.

Accepted Answer

A) True 
 B)False

Question 11

What are the two longest stages in the life of a one-solar-mass star?

Accepted Answer

A)  Protostar, pre-main-sequence 
B)  Protostar, white dwarf 
C)  Protostar, main-sequence 
D)  Main-sequence, white dwarf 
A)  Protostar, pre-main-sequence 
B)  Protostar, white dwarf 
C)  Protostar, main-sequence 
D)  Main-sequence, white dwarf

Question 12

A nova is a new star.

Accepted Answer

A) True 
 B)False

Question 13

Which nuclear fusion processes occur in Sun-like stars?

Accepted Answer

A)  triple alpha 
B)  CNO and triple alpha 
C)  proton-proton and triple alpha 
D)  All of the other choices are correct. 
A)  triple alpha 
B)  CNO and triple alpha 
C)  proton-proton and triple alpha 
D)  All of the other choices are correct.

Question 14

A white dwarf is composed of

Accepted Answer

A)  hydrogen nuclei and degenerate electrons. 
B)  helium nuclei and normal electrons. 
C)  carbon and oxygen nuclei and degenerate electrons. 
D)  degenerate iron nuclei. 
E)  a helium burning core and a hydrogen burning shell. 
A)  hydrogen nuclei and degenerate electrons. 
B)  helium nuclei and normal electrons. 
C)  carbon and oxygen nuclei and degenerate electrons. 
D)  degenerate iron nuclei. 
E)  a helium burning core and a hydrogen burning shell.

Question 15

A type II supernova

Accepted Answer

A)  occurs when a white dwarf's mass exceeds the Chandrasekhar limit. 
B)  is the result of helium flash. 
C)  is characterized by a spectrum that shows hydrogen lines. 
D)  occurs when the iron core of a massive star collapses. 
E)  is characterized by a spectrum that shows hydrogen lines and occurs when the iron core of a massive star collapses. 
A)  occurs when a white dwarf's mass exceeds the Chandrasekhar limit. 
B)  is the result of helium flash. 
C)  is characterized by a spectrum that shows hydrogen lines. 
D)  occurs when the iron core of a massive star collapses. 
E)  is characterized by a spectrum that shows hydrogen lines and occurs when the iron core of a massive star collapses.

Question 16

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 17

If the theory that novae occur in close binary systems is correct, then recurrent novae should

Accepted Answer

A)  produce synchrotron radiation. 
B)  occur in regions of star formation. 
C)  not occur in old star clusters. 
D)  all be visual binaries. 
E)  repeat after some interval. 
A)  produce synchrotron radiation. 
B)  occur in regions of star formation. 
C)  not occur in old star clusters. 
D)  all be visual binaries. 
E)  repeat after some interval.

Question 18

Stars within a cluster that are at the turnoff point

Accepted Answer

A)  have life expectancies that are equal to the age of the cluster. 
B)  are stars that are just becoming white dwarfs. 
C)  are stars that are just entering the main sequence portion of their evolution. 
D)  are stars that are about to supernova. 
E)  are stars that are generally spectral type G stars. 
A)  have life expectancies that are equal to the age of the cluster. 
B)  are stars that are just becoming white dwarfs. 
C)  are stars that are just entering the main sequence portion of their evolution. 
D)  are stars that are about to supernova. 
E)  are stars that are generally spectral type G stars.

Question 19

The central star in a planetary nebula

Accepted Answer

A)  is a main-sequence star. 
B)  is a pre-main-sequence protostar. 
C)  is a neutron star. 
D)  will become a white dwarf. 
A)  is a main-sequence star. 
B)  is a pre-main-sequence protostar. 
C)  is a neutron star. 
D)  will become a white dwarf.

Question 20

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

Accepted Answer

We can judge the age of a star cluster b

Once a star ejects a planetary nebula, it becomes a white dwarf.

In the visual wavelength image, a/an ______________ cluster is shown.

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

Stars that have ejected a planetary nebula eventually become

The triple-alpha process involves the fusion of

The Chandrasekhar limit tells us that

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

If the Sun and stars are supported by gas pressure, what supports a white dwarf?

A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/s. What is the approximate age of this planetary nebula? (1 pc is equal to 3 × 10¹³ km and 1 year is equal to 3.15 × 10⁷ seconds.)

Stars less massive than 0.4 solar mass never become giant stars.

What are the two longest stages in the life of a one-solar-mass star?

A nova is a new star.

Which nuclear fusion processes occur in Sun-like stars?

A white dwarf is composed of

A type II supernova

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

If the theory that novae occur in close binary systems is correct, then recurrent novae should

Stars within a cluster that are at the turnoff point

The central star in a planetary nebula

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

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

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 10: The Deaths of Stars

Once a star ejects a planetary nebula, it becomes a white dwarf.

​ In the visual wavelength image, a/an ______________ cluster is shown.

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

Stars that have ejected a planetary nebula eventually become

The triple-alpha process involves the fusion of

The Chandrasekhar limit tells us that

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

If the Sun and stars are supported by gas pressure, what supports a white dwarf?

A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/s. What is the approximate age of this planetary nebula? (1 pc is equal to 3 × 1013 km and 1 year is equal to 3.15 × 107 seconds.)

Stars less massive than 0.4 solar mass never become giant stars.

What are the two longest stages in the life of a one-solar-mass star?

A nova is a new star.

Which nuclear fusion processes occur in Sun-like stars?

A white dwarf is composed of

A type II supernova

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

If the theory that novae occur in close binary systems is correct, then recurrent novae should

Stars within a cluster that are at the turnoff point

The central star in a planetary nebula

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

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

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

In the visual wavelength image, a/an ______________ cluster is shown.

A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/s. What is the approximate age of this planetary nebula? (1 pc is equal to 3 × 10¹³ km and 1 year is equal to 3.15 × 10⁷ seconds.)