Question 1

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

Accepted Answer

Sgr A*,Sagittarius A*

Question 2

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

Accepted Answer

​ 
They can be used to calibrate the period-luminosity relation, which is used to determine distances to stars.

Question 3

The chemical abundance of population I stars

Accepted Answer

A)  indicates that they were formed before the population II stars. 
B)  indicates that the material they formed from had been enriched with material from supernovae. 
C)  indicates that they contain very few heavy metals compared to halo stars. 
D)  depends on the temperature of the star. 
E)  depends on the mass of the star. 
A)  indicates that they were formed before the population II stars. 
B)  indicates that the material they formed from had been enriched with material from supernovae. 
C)  indicates that they contain very few heavy metals compared to halo stars. 
D)  depends on the temperature of the star. 
E)  depends on the mass of the star. B

Question 4

The rotation curve of the galaxy provides evidence for the existence of the ____________________ which extends beyond the halo of the galaxy.

Accepted Answer

The answer of The rotation curve of the galaxy provides...

Question 5

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

Accepted Answer

​ 
The first stars formed from gas that

Question 6

In the above graph, what does 5.36634 indicate according to your text?

Accepted Answer

A)  orbital period 
B)  rotation period 
C)  period of the star changing size 
D)  period of the star changing brightness 
A)  orbital period 
B)  rotation period 
C)  period of the star changing size 
D)  period of the star changing brightness

Question 7

_______________ is the rate at which a star moves across the sky.

Accepted Answer

The answer of _______________ is the rate at which a...

Question 8

What behavior do galactic rotation curves exhibit to suggest the existence of dark matter in an extended halo?

Accepted Answer

A)  Small velocities are seen at large distances from the galactic center. 
B)  Small velocities are seen at distances close to the galactic center. 
C)  Large velocities are seen at large distances from the galactic center. 
D)  Large velocities are seen at distances close to the galactic center. 
A)  Small velocities are seen at large distances from the galactic center. 
B)  Small velocities are seen at distances close to the galactic center. 
C)  Large velocities are seen at large distances from the galactic center. 
D)  Large velocities are seen at distances close to the galactic center.

Question 9

The center of our galaxy lies in the direction of the constellation of

Accepted Answer

A)  Ursa Minor. 
B)  Ursa Major. 
C)  Sagittarius. 
D)  Orion. 
E)  Monoceros. 
A)  Ursa Minor. 
B)  Ursa Major. 
C)  Sagittarius. 
D)  Orion. 
E)  Monoceros.

Question 10

What is the orientation of the galaxy shown above relative to Earth?

Accepted Answer

A)  face-on 
B)  edge-on 
C)  not quite edge-on 
D)  not quite face-on 
A)  face-on 
B)  edge-on 
C)  not quite edge-on 
D)  not quite face-on

Question 11

Which of the following can't be associated with the spiral arms of a galaxy?

Accepted Answer

A)  dust and gas 
B)  metal-poor stars 
C)  young, massive stars 
D)  star formation 
A)  dust and gas 
B)  metal-poor stars 
C)  young, massive stars 
D)  star formation

Question 12

Any element heavier than helium is collectively referred to as a _______________.

Accepted Answer

The answer of Any element heavier than helium is collectively...

Question 13

Population II stars
I. are primarily found in the disk of the galaxy.
II. contain more heavy metals than population I stars.
III. are primarily old low-mass stars.
IV. are located in globular clusters.

Accepted Answer

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

Question 14

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 15

The disk of the galaxy is older than the halo.

Accepted Answer

A) True 
 B)False

Question 16

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 17

If the spiral density wave were the only thing producing spiral arms, it would be expected that

Accepted Answer

A)  all spiral arms would be gas and dust free. 
B)  all galaxies would have only two smooth spiral arms. 
C)  the Milky Way would show and irregular pattern of short arms . 
D)  the Milky Way wouldn't have any spiral arms. 
E)  the halo component of the Milky Way would show spiral arms as well. 
A)  all spiral arms would be gas and dust free. 
B)  all galaxies would have only two smooth spiral arms. 
C)  the Milky Way would show and irregular pattern of short arms . 
D)  the Milky Way wouldn't have any spiral arms. 
E)  the halo component of the Milky Way would show spiral arms as well.

Question 18

You observe a variable star and find its period to be about 6 days and its M V to be -3.4. Which object best describes the system or type of system you are observing using the above graph?

Accepted Answer

A)  RR Lyrae 
B)  Type II Cepheids 
C)  Type I Cepheids 
D)  Delta Cephei 
A)  RR Lyrae 
B)  Type II Cepheids 
C)  Type I Cepheids 
D)  Delta Cephei

Question 19

Where are the Large Magellanic Cloud and Small Magellanic Cloud located?

Accepted Answer

A)  in the spiral arms 
B)  in the disk 
C)  in the bulge 
D)  None of the other choices are correct. 
A)  in the spiral arms 
B)  in the disk 
C)  in the bulge 
D)  None of the other choices are correct.

Question 20

The Sun is at the center of the Milky Way galaxy.

Accepted Answer

A) True 
 B)False

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

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

The chemical abundance of population I stars

The rotation curve of the galaxy provides evidence for the existence of the ____________________ which extends beyond the halo of the galaxy.

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

In the above graph, what does 5.36634 indicate according to your text?

_______________ is the rate at which a star moves across the sky.

What behavior do galactic rotation curves exhibit to suggest the existence of dark matter in an extended halo?

The center of our galaxy lies in the direction of the constellation of

What is the orientation of the galaxy shown above relative to Earth?

Which of the following can't be associated with the spiral arms of a galaxy?

Any element heavier than helium is collectively referred to as a _______________.

Population II stars I. are primarily found in the disk of the galaxy. II. contain more heavy metals than population I stars. III. are primarily old low-mass stars. IV. are located in globular clusters.

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 disk of the galaxy is older than the halo.

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

If the spiral density wave were the only thing producing spiral arms, it would be expected that

You observe a variable star and find its period to be about 6 days and its M _V to be -3.4. Which object best describes the system or type of system you are observing using the above graph?

Where are the Large Magellanic Cloud and Small Magellanic Cloud located?

The Sun is at the center 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

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 12: The Milky Way Galaxy

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

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

The chemical abundance of population I stars

The rotation curve of the galaxy provides evidence for the existence of the ____________________ which extends beyond the halo of the galaxy.

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

In the above graph, what does 5.36634 indicate according to your text?

_______________ is the rate at which a star moves across the sky.

What behavior do galactic rotation curves exhibit to suggest the existence of dark matter in an extended halo?

The center of our galaxy lies in the direction of the constellation of

What is the orientation of the galaxy shown above relative to Earth?

Which of the following can't be associated with the spiral arms of a galaxy?

Any element heavier than helium is collectively referred to as a _______________.

Population II stars I. are primarily found in the disk of the galaxy. II. contain more heavy metals than population I stars. III. are primarily old low-mass stars. IV. are located in globular clusters.

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 disk of the galaxy is older than the halo.

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

If the spiral density wave were the only thing producing spiral arms, it would be expected that

You observe a variable star and find its period to be about 6 days and its M V to be -3.4. Which object best describes the system or type of system you are observing using the above graph?

Where are the Large Magellanic Cloud and Small Magellanic Cloud located?

The Sun is at the center 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

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

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

You observe a variable star and find its period to be about 6 days and its M _V to be -3.4. Which object best describes the system or type of system you are observing using the above graph?