Question 1

What is the importance of 1.4 solar masses in stellar evolution?

Accepted Answer

1.4 solar masses is the Chandrasekhar li

Question 2

If it gains sufficient mass from a binary companion, a white dwarf can become a

Accepted Answer

A)  black dwarf. 
B)  planetary nebula. 
C)  Type II supernova. 
D)  brown dwarf. 
E)  Type I supernova. 
A)  black dwarf. 
B)  planetary nebula. 
C)  Type II supernova. 
D)  brown dwarf. 
E)  Type I supernova.

Question 3

What temperature is needed to fuse helium into carbon?

Accepted Answer

A)  5,800 K 
B)  100,000 K 
C)  15 million K 
D)  100 million K 
E)  one billion K 
A)  5,800 K 
B)  100,000 K 
C)  15 million K 
D)  100 million K 
E)  one billion K

Question 4

A small, dense star the size of Earth that shines by only stored heat is a

Accepted Answer

A)  blue straggler. 
B)  white dwarf. 
C)  blue dwarf. 
D)  black dwarf. 
E)  brown dwarf. 
A)  blue straggler. 
B)  white dwarf. 
C)  blue dwarf. 
D)  black dwarf. 
E)  brown dwarf.

Question 5

A recurrent nova could eventually build up to a

Accepted Answer

A)  core composed of iron. 
B)  Type II supernova. 
C)  helium flash. 
D)  planetary nebula. 
E)  Type I supernova. 
A)  core composed of iron. 
B)  Type II supernova. 
C)  helium flash. 
D)  planetary nebula. 
E)  Type I supernova.

Question 6

Paradoxically, while the core of the red giant is contracting and heating up, its radiation pressure causes its photosphere to swell up and cool off.

Accepted Answer

A) True 
 B)False

Question 7

Which stars in globular clusters are believed to be examples of mergers?

Accepted Answer

A)  blue stragglers 
B)  brown dwarfs 
C)  planetary nebulae cores 
D)  blue supergiants 
E)  eclipsing binaries 
A)  blue stragglers 
B)  brown dwarfs 
C)  planetary nebulae cores 
D)  blue supergiants 
E)  eclipsing binaries

Question 8

Most of the energy released during a supernova is emitted as neutrinos.

Accepted Answer

A) True 
 B)False

Question 9

As a 6 solar- mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity

Accepted Answer

A)  first decreases, then increases. 
B)  first increases, then decreases. 
C)  remains roughly constant. 
D)  decreases. 
E)  increases. 
A)  first decreases, then increases. 
B)  first increases, then decreases. 
C)  remains roughly constant. 
D)  decreases. 
E)  increases.

Question 10

The outward pressure in the core of a red giant balances the inward pull of gravity when

Accepted Answer

A)  the electrons and protons have combined to form neutrons. 
B)  hydrogen begins fusing into helium. 
C)  iron forms in the inner core. 
D)  carbon fuses into heavier elements. 
E)  the electron orbits are compressed so much they are all in contact. 
A)  the electrons and protons have combined to form neutrons. 
B)  hydrogen begins fusing into helium. 
C)  iron forms in the inner core. 
D)  carbon fuses into heavier elements. 
E)  the electron orbits are compressed so much they are all in contact.

Question 11

On the H- R diagram, a star's position on the main sequence depends on the star's
.

Accepted Answer

The answer of On the H- R diagram, a star's...

Question 12

The number of Type I and Type II supernovae observed are approximately equal.

Accepted Answer

A) True 
 B)False

Question 13

Our Sun will fade in luminosity as its supply of hydrogen drops in a billion years.

Accepted Answer

A) True 
 B)False

Question 14

Like emission nebulae, planetary nebulae glow because hot stars are causing the gases to ionize when exposed to strong ultraviolet radiation.

Accepted Answer

A) True 
 B)False

Question 15

Why is our Sun not forming carbon and heavier elements yet?

Accepted Answer

It still has plenty of hydrogen in its c

Question 16

Contrast the deaths of low- versus high- mass stars.

Accepted Answer

Low- mass stars swell up as red giants,

Question 17

Will the Sun become a brown dwarf? Explain.

Accepted Answer

No, our Sun is massive enough

Question 18

Solar mass stars eventually become hot enough for carbon nuclei to fuse together.

Accepted Answer

A) True 
 B)False

Question 19

Helium fusion requires a higher temperature than hydrogen fusion.

Accepted Answer

A) True 
 B)False

Question 20

Compared to a cluster containing type O and B stars, a cluster with only type F and cooler stars will be

Accepted Answer

A)  younger. 
B)  further away. 
C)  older. 
D)  more obscured by dust. 
E)  less obscured by dust. 
A)  younger. 
B)  further away. 
C)  older. 
D)  more obscured by dust. 
E)  less obscured by dust.

What is the importance of 1.4 solar masses in stellar evolution?

If it gains sufficient mass from a binary companion, a white dwarf can become a

What temperature is needed to fuse helium into carbon?

A small, dense star the size of Earth that shines by only stored heat is a

A recurrent nova could eventually build up to a

Paradoxically, while the core of the red giant is contracting and heating up, its radiation pressure causes its photosphere to swell up and cool off.

Which stars in globular clusters are believed to be examples of mergers?

Most of the energy released during a supernova is emitted as neutrinos.

As a 6 solar- mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity

The outward pressure in the core of a red giant balances the inward pull of gravity when

On the H- R diagram, a star's position on the main sequence depends on the star's .

The number of Type I and Type II supernovae observed are approximately equal.

Our Sun will fade in luminosity as its supply of hydrogen drops in a billion years.

Like emission nebulae, planetary nebulae glow because hot stars are causing the gases to ionize when exposed to strong ultraviolet radiation.

Why is our Sun not forming carbon and heavier elements yet?

Contrast the deaths of low- versus high- mass stars.

Will the Sun become a brown dwarf? Explain.

Solar mass stars eventually become hot enough for carbon nuclei to fuse together.

Helium fusion requires a higher temperature than hydrogen fusion.

Compared to a cluster containing type O and B stars, a cluster with only type F and cooler stars will be

Charting the Heavens: the Foundations of Astronomy

The Copernican Revolution: the Birth of Modern Science

Light and Matter: the Inner Workings of the Cosmos

Telescopes: the Tools of Astronomy

The Solar System: Interplanetary Matter and the Birth of the Planets

Earth and Its Moon: Our Cosmic Backyard

The Terrestrial Planets: a Study in Contrasts

The Jovian Planets: Giants of the Solar System

Moons, Rings, and Plutoids: Small Worlds Among Giants

The Sun: Our Parent Star

Measuring the Stars: Giants, Dwarfs, and the Main Sequence

The Interstellar Medium: Star Formation in the Milky Way

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: a Spiral in Space

Normal and Active Galaxies: Building Blocks of the Universe

Hubbles Law and Dark Matter: the Large-Scale Structure of the Cosmos

Cosmology: the Big Bang and the Fate of the Universe

Life in the Universe: Are We Alone

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Exam 13: Stellar Evolution: the Lives and Deaths of Stars

What is the importance of 1.4 solar masses in stellar evolution?

If it gains sufficient mass from a binary companion, a white dwarf can become a

What temperature is needed to fuse helium into carbon?

A small, dense star the size of Earth that shines by only stored heat is a

A recurrent nova could eventually build up to a

Paradoxically, while the core of the red giant is contracting and heating up, its radiation pressure causes its photosphere to swell up and cool off.

Which stars in globular clusters are believed to be examples of mergers?

Most of the energy released during a supernova is emitted as neutrinos.

As a 6 solar- mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity

The outward pressure in the core of a red giant balances the inward pull of gravity when

On the H- R diagram, a star's position on the main sequence depends on the star's .

The number of Type I and Type II supernovae observed are approximately equal.

Our Sun will fade in luminosity as its supply of hydrogen drops in a billion years.

Like emission nebulae, planetary nebulae glow because hot stars are causing the gases to ionize when exposed to strong ultraviolet radiation.

Why is our Sun not forming carbon and heavier elements yet?

Contrast the deaths of low- versus high- mass stars.

Will the Sun become a brown dwarf? Explain.

Solar mass stars eventually become hot enough for carbon nuclei to fuse together.

Helium fusion requires a higher temperature than hydrogen fusion.

Compared to a cluster containing type O and B stars, a cluster with only type F and cooler stars will be

Charting the Heavens: the Foundations of Astronomy

The Copernican Revolution: the Birth of Modern Science

Light and Matter: the Inner Workings of the Cosmos

Telescopes: the Tools of Astronomy

The Solar System: Interplanetary Matter and the Birth of the Planets

Earth and Its Moon: Our Cosmic Backyard

The Terrestrial Planets: a Study in Contrasts

The Jovian Planets: Giants of the Solar System

Moons, Rings, and Plutoids: Small Worlds Among Giants

The Sun: Our Parent Star

Measuring the Stars: Giants, Dwarfs, and the Main Sequence

The Interstellar Medium: Star Formation in the Milky Way

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: a Spiral in Space

Normal and Active Galaxies: Building Blocks of the Universe

Hubbles Law and Dark Matter: the Large-Scale Structure of the Cosmos

Cosmology: the Big Bang and the Fate of the Universe

Life in the Universe: Are We Alone

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