Question 1

How is the age of a star cluster determined?

Accepted Answer

The stars are plotted on an H-R diagram.

Question 2

Refer to the figure above. What is the name of the star labeled 10?

Accepted Answer

A) planetary nebula 
B) red giant branch 
C) horizontal branch 
D) asymptotic giant branch 
E) white dwarf 
A) planetary nebula 
B) red giant branch 
C) horizontal branch 
D) asymptotic giant branch 
E) white dwarf

Question 3

When a star's inward gravity and outward pressure are balanced, the star is said to be:

Accepted Answer

A) in gravitational collapse. 
B) in thermal expansion. 
C) in rotational equilibrium. 
D) in hydrostatic equilibrium. 
E) a stage 2 protostar. 
A) in gravitational collapse. 
B) in thermal expansion. 
C) in rotational equilibrium. 
D) in hydrostatic equilibrium. 
E) a stage 2 protostar.

Question 4

Will the Sun ever turn into a brown dwarf? Why or why not?

Accepted Answer

No, it is massive enough to ig

Question 5

Low mass stars should produce white dwarfs, while high mass stars will produce morecompact end products.

Accepted Answer

A) True 
 B)False

Question 6

The thermonuclear process in high mass stars that produces one atom of helium from four ofhydrogen is the ________.

Accepted Answer

The answer of The thermonuclear process in high mass stars...

Question 7

The age of a star cluster may be estimated by determining the ________ of the MainSequence at which stars are just in the process of evolving away to become giant stars.

Accepted Answer

The answer of The age of a star cluster may...

Question 8

Which of the following best describes the evolutionary track followed on the H-R diagramfor the most massive stars?

Accepted Answer

A) vertically upward, along the left edge of the diagram 
B) diagonally to lower right, then vertical, then horizontally left 
C) horizontally right, diagonally to lower left, then horizontally right 
D) horizontally right 
E) horizontally right, then forms a clockwise loop 
A) vertically upward, along the left edge of the diagram 
B) diagonally to lower right, then vertical, then horizontally left 
C) horizontally right, diagonally to lower left, then horizontally right 
D) horizontally right 
E) horizontally right, then forms a clockwise loop

Question 9

Which of the following best describes the evolutionary track of the most massive stars?

Accepted Answer

A) diagonally to lower right, then vertical, then horizontal left 
B) horizontally right, diagonal to lower left, then horizontal right 
C) horizontal right, then a clockwise loop 
D) horizontal right 
E) vertically left, then straight down 
A) diagonally to lower right, then vertical, then horizontal left 
B) horizontally right, diagonal to lower left, then horizontal right 
C) horizontal right, then a clockwise loop 
D) horizontal right 
E) vertically left, then straight down

Question 10

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

Accepted Answer

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

Question 11

At which stage in a Sun-like star's life is its core the least dense?

Accepted Answer

A) Main Sequence 
B) Subgiant Branch 
C) Helium Fusion 
D) Planetary Nebula 
E) White Dwarf 
A) Main Sequence 
B) Subgiant Branch 
C) Helium Fusion 
D) Planetary Nebula 
E) White Dwarf

Question 12

As a star begins to evolve away from the main sequence, it gets larger.

Accepted Answer

A) True 
 B)False

Question 13

Refer to the figure above. What is the name of the path between the points labeled 10 and11?

Accepted Answer

A) planetary nebula 
B) red giant branch 
C) horizontal branch 
D) asymptotic giant branch 
E) white dwarf 
A) planetary nebula 
B) red giant branch 
C) horizontal branch 
D) asymptotic giant branch 
E) white dwarf

Question 14

The age of a star cluster can be determined by the luminosity of the main sequence turnoffinto the giant stage.

Accepted Answer

A) True 
 B)False

Question 15

Every red dwarf star that ever joined the main sequence is still there today.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following is NOT a possible reason that Sirius was recorded as red between100 B.C. and 200 A.D., even though it is now seen as blue white?

Accepted Answer

A) Sirius A evolved from a red giant to a blue white star. 
B) The companion white dwarf, Sirius B, was a bright red giant during those years. 
C) There was a mistake made and propagated by scribes who copied the records. 
D) There was a galactic dust cloud that passed between Sirius and us. 
A) Sirius A evolved from a red giant to a blue white star. 
B) The companion white dwarf, Sirius B, was a bright red giant during those years. 
C) There was a mistake made and propagated by scribes who copied the records. 
D) There was a galactic dust cloud that passed between Sirius and us.

Question 17

A star (no matter what its mass)spends most of its life:

Accepted Answer

A) as a protostar. 
B) as a main sequence star. 
C) as a planetary nebula. 
D) as a red giant or supergiant. 
E) as a T Tauri variable star. 
A) as a protostar. 
B) as a main sequence star. 
C) as a planetary nebula. 
D) as a red giant or supergiant. 
E) as a T Tauri variable star.

Question 18

________ clusters are much older and richer than open clusters.

Accepted Answer

The answer of ________ clusters are much older and richer...

Question 19

The brightest stars of a young open cluster will be:

Accepted Answer

A) Cepheid variables. 
B) massive blue main sequence stars. 
C) red giants. 
D) yellow main sequence stars like the Sun. 
E) T Tauri variables. 
A) Cepheid variables. 
B) massive blue main sequence stars. 
C) red giants. 
D) yellow main sequence stars like the Sun. 
E) T Tauri variables.

Question 20

The thermonuclear process in solar and less massive stars, which produces one atom of heliumfrom four of hydrogen, is the ________.

Accepted Answer

The answer of The thermonuclear process in solar and less...

Exam 20: Stellar Evolution: The Life and Death of a Star

How is the age of a star cluster determined?

Refer to the figure above. What is the name of the star labeled 10?

When a star's inward gravity and outward pressure are balanced, the star is said to be:

Will the Sun ever turn into a brown dwarf? Why or why not?

Low mass stars should produce white dwarfs, while high mass stars will produce morecompact end products.

The thermonuclear process in high mass stars that produces one atom of helium from four ofhydrogen is the ________.

The age of a star cluster may be estimated by determining the ________ of the MainSequence at which stars are just in the process of evolving away to become giant stars.

Which of the following best describes the evolutionary track followed on the H-R diagramfor the most massive stars?

Which of the following best describes the evolutionary track of the most massive stars?

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

At which stage in a Sun-like star's life is its core the least dense?

As a star begins to evolve away from the main sequence, it gets larger.

Refer to the figure above. What is the name of the path between the points labeled 10 and11?

The age of a star cluster can be determined by the luminosity of the main sequence turnoffinto the giant stage.

Every red dwarf star that ever joined the main sequence is still there today.

Which of the following is NOT a possible reason that Sirius was recorded as red between100 B.C. and 200 A.D., even though it is now seen as blue white?

A star (no matter what its mass)spends most of its life:

________ clusters are much older and richer than open clusters.

The brightest stars of a young open cluster will be:

The thermonuclear process in solar and less massive stars, which produces one atom of heliumfrom four of hydrogen, is the ________.

Charting the Heavens: The Foundations of Astronomy

The Copernican Revolution: The Birth of Modern Science

Radiation: Information From the Cosmos

Spectroscopy: the Inner Workings of Atoms

Telescopes: The Tools of Astronomy

The Solar System: Comparative Planetology and Formation Models

Earth: Our Home in Space

The Moon and Mercury: Scorched and Battered Worlds

Venus: Earths Sister Planet

Mars: a Near Miss for Life

Jupiter: Giant of the Solar System

Saturn: Spectacular Rings and Mysterious Moons

Uranus and Neptune: The Outer Worlds of the Solar System

Solar System Debris: Keys to Our Origin

Exoplanets: Planetary Systems Beyond Our Own

The Sun: Our Parent Star

The Stars: Giants, Dwarfs, and the Main Sequence

The Interstellar Medium: Gas and Dust Among the Stars

Star Formation: a Traumatic Birth

Stellar Explosions: Novae, Supernovae, and the Formation of the Elements

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: a Spiral in Space

Galaxies: Building Blocks of the Universe

Galaxies and Dark Matter: The Large-Scale Structure of the Cosmos

Cosmology: The Big Bang and the Fate of the Universe

The Early Universe: Toward the Beginning of Time

Life in the Universe: Are We Alone

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