Question 1

The mass of the black hole at the center of our galaxy can be estimated using the ____ of a star orbiting it.

Accepted Answer

A)  semi-major axis 
B)  orbital period 
C)  Both answers a and b 
D)  Neither answer a nor b 
A)  semi-major axis 
B)  orbital period 
C)  Both answers a and b 
D)  Neither answer a nor b C

Question 2

Why does the average chemical composition of stars now forming differ from that of older stars?

Accepted Answer

Answer not provided.

Question 3

Sgr A* is believed to be the center of the Milky Way galaxy because

Accepted Answer

A)  I & II only 
B)  II & III only 
C)  I & IV only 
D)  II & IV only 
E)  All of I, II, III, & IV 
A)  I & II only 
B)  II & III only 
C)  I & IV only 
D)  II & IV only 
E)  All of I, II, III, & IV E

Question 4

The center of our galaxy is believed to be occupied by the radio source known as ____________________.

Accepted Answer

Sgr A*
Sag

Question 5

The rapid rotation in the outer disk suggests that our galaxy is more massive than previously thought.

Accepted Answer

A) True 
 B)False

Question 6

How does the density wave theory explain the presence of young stars in the spiral arms?

Accepted Answer

The answer of How does the density wave theory explain...

Question 7

What evidence do we have that the center of our galaxy is a powerful source of energy? A massive black hole?

Accepted Answer

The center of our galaxy, the Milky Way,

Question 8

The ____________________ of the galaxy contains population I stars, open clusters, and gas clouds.

Accepted Answer

The answer of The ____________________ of the galaxy contains population...

Question 9

The orbits of population I stars

Accepted Answer

A)  I 
B)  IV 
C)  I & IV 
D)  II & IV 
E)  I & III 
A)  I 
B)  IV 
C)  I & IV 
D)  II & IV 
E)  I & III

Question 10

The nuclear bulge of our galaxy

Accepted Answer

A)  contains stars that are primarily population I stars. 
B)  is primarily composed of gas and dust. 
C)  contains stars primarily associated with the spherical component of our galaxy. 
D)  contains stars primarily associated with the disk component of our galaxy. 
E)  a, b and d 
A)  contains stars that are primarily population I stars. 
B)  is primarily composed of gas and dust. 
C)  contains stars primarily associated with the spherical component of our galaxy. 
D)  contains stars primarily associated with the disk component of our galaxy. 
E)  a, b and d

Question 11

An approximately spherical cluster of over 100,000 stars that formed at the same time long ago in our galaxy is

Accepted Answer

A)  a globular cluster. 
B)  an open cluster. 
C)  an association. 
D)  a spherical component 
E)  an accretion disk. 
A)  a globular cluster. 
B)  an open cluster. 
C)  an association. 
D)  a spherical component 
E)  an accretion disk.

Question 12

Discuss how astronomers know that our galaxy contains spiral arms in its disk.

Accepted Answer

The answer of Discuss how astronomers know that our galaxy...

Question 13

Figure 12-1  
-Refer to Figure 12-1. A Type II Cepheid has been located in a distant globular cluster with a period of 10 days. What is the star's absolute magnitude?

Accepted Answer

A)  (-1) 
B)  0 
C)  (-4) 
D)  (- 6) 
E)  The absolute magnitude of a Cepheid variable cannot be determined unless its distance is known. 
A)  (-1) 
B)  0 
C)  (-4) 
D)  (- 6) 
E)  The absolute magnitude of a Cepheid variable cannot be determined unless its distance is known.

Question 14

The first stars to form in our galaxy

Accepted Answer

A)  had circular orbits. 
B)  had highly elongated elliptical orbits. 
C)  were population I stars. 
D)  all had orbits in the same plane. 
E)  formed the galactic clusters we see today. 
A)  had circular orbits. 
B)  had highly elongated elliptical orbits. 
C)  were population I stars. 
D)  all had orbits in the same plane. 
E)  formed the galactic clusters we see today.

Question 15

The age of the Milky Way galaxy has been estimated to be at least 13 billion years based on

Accepted Answer

A)  observations of globular clusters. 
B)  observations of open clusters. 
C)  21-cm radiation from H I regions. 
D)  the rotation curve of the galaxy. 
E)  the energy produced by Sagittarius A*. 
A)  observations of globular clusters. 
B)  observations of open clusters. 
C)  21-cm radiation from H I regions. 
D)  the rotation curve of the galaxy. 
E)  the energy produced by Sagittarius A*.

Question 16

Which of the following is not a characteristic of the stars of the disk component of our galaxy?

Accepted Answer

A)  circular orbits 
B)  randomly inclined orbits 
C)  higher metal abundance 
D)  young stars 
E)  star-formation regions 
A)  circular orbits 
B)  randomly inclined orbits 
C)  higher metal abundance 
D)  young stars 
E)  star-formation regions

Question 17

How does the density wave theory explain the presence of young stars in the spiral arms?

Accepted Answer

The answer of How does the density wave theory explain...

Question 18

Radio maps of the spiral arms of our galaxy

Accepted Answer

A)  reveal that our galaxy is a grand design spiral. 
B)  map the location of hot O and B stars by the radio radiation they emit. 
C)  reveal that the spiral arms are winding up and growing closer together. 
D)  reveal that the sun is currently located in the center of a spiral arm. 
E)  map the location of dense neutral hydrogen clouds. 
A)  reveal that our galaxy is a grand design spiral. 
B)  map the location of hot O and B stars by the radio radiation they emit. 
C)  reveal that the spiral arms are winding up and growing closer together. 
D)  reveal that the sun is currently located in the center of a spiral arm. 
E)  map the location of dense neutral hydrogen clouds.

Question 19

____ in other galaxies should contain luminous O and B stars if they are like the Milky Way.

Accepted Answer

A)  The halos 
B)  The bulges 
C)  The spiral arms 
D)  The globular clusters 
E)  The coronas 
A)  The halos 
B)  The bulges 
C)  The spiral arms 
D)  The globular clusters 
E)  The coronas

Question 20

Why are Cepheid variable stars important in our study of the Milky Way galaxy?

Accepted Answer

The answer of Why are Cepheid variable stars important in...

The mass of the black hole at the center of our galaxy can be estimated using the ____ of a star orbiting it.

Why does the average chemical composition of stars now forming differ from that of older stars?

Sgr A* is believed to be the center of the Milky Way galaxy because

The center of our galaxy is believed to be occupied by the radio source known as ____________________.

The rapid rotation in the outer disk suggests that our galaxy is more massive than previously thought.

How does the density wave theory explain the presence of young stars in the spiral arms?

What evidence do we have that the center of our galaxy is a powerful source of energy? A massive black hole?

The ____________________ of the galaxy contains population I stars, open clusters, and gas clouds.

The orbits of population I stars

The nuclear bulge of our galaxy

An approximately spherical cluster of over 100,000 stars that formed at the same time long ago in our galaxy is

Discuss how astronomers know that our galaxy contains spiral arms in its disk.

Figure 12-1 -Refer to Figure 12-1. A Type II Cepheid has been located in a distant globular cluster with a period of 10 days. What is the star's absolute magnitude?

The first stars to form in our galaxy

The age of the Milky Way galaxy has been estimated to be at least 13 billion years based on

Which of the following is not a characteristic of the stars of the disk component of our galaxy?

How does the density wave theory explain the presence of young stars in the spiral arms?

Radio maps of the spiral arms of our galaxy

____ in other galaxies should contain luminous O and B stars if they are like the Milky Way.

Why are Cepheid variable stars important in our study of the Milky Way galaxy?

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

The Deaths of Stars

Neutron Stars and Black Holes

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 12: The Milky Way Galaxy

The mass of the black hole at the center of our galaxy can be estimated using the ____ of a star orbiting it.

Why does the average chemical composition of stars now forming differ from that of older stars?

Sgr A* is believed to be the center of the Milky Way galaxy because

The center of our galaxy is believed to be occupied by the radio source known as ____________________.

The rapid rotation in the outer disk suggests that our galaxy is more massive than previously thought.

How does the density wave theory explain the presence of young stars in the spiral arms?

What evidence do we have that the center of our galaxy is a powerful source of energy? A massive black hole?

The ____________________ of the galaxy contains population I stars, open clusters, and gas clouds.

The orbits of population I stars

The nuclear bulge of our galaxy

An approximately spherical cluster of over 100,000 stars that formed at the same time long ago in our galaxy is

Discuss how astronomers know that our galaxy contains spiral arms in its disk.

Figure 12-1 -Refer to Figure 12-1. A Type II Cepheid has been located in a distant globular cluster with a period of 10 days. What is the star's absolute magnitude?

The first stars to form in our galaxy

The age of the Milky Way galaxy has been estimated to be at least 13 billion years based on

Which of the following is not a characteristic of the stars of the disk component of our galaxy?

How does the density wave theory explain the presence of young stars in the spiral arms?

Radio maps of the spiral arms of our galaxy

____ in other galaxies should contain luminous O and B stars if they are like the Milky Way.

Why are Cepheid variable stars important in our study of the Milky Way galaxy?

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

The Deaths of Stars

Neutron Stars and Black Holes

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