Question 1

What is the difference between a population I star and a population II star?

Accepted Answer

The answer of What is the difference between a population...

Question 2

This is a "thought" question. Why are few galaxies outside our own galaxy seen in the circle around the sky where the Milky Way is located? This is because

Accepted Answer

A)  there aren't any galaxies in those directions. 
B)  dust in the Milky Way blots out our view of galaxies in those directions. 
C)  the missing mass is in those directions. 
D)  the Big Bang has blown galaxies away from those directions. 
A)  there aren't any galaxies in those directions. 
B)  dust in the Milky Way blots out our view of galaxies in those directions. 
C)  the missing mass is in those directions. 
D)  the Big Bang has blown galaxies away from those directions.

Question 3

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 4

How do theories of the origin of the Milky Way explain its halo?

Accepted Answer

Theories of the origin of the Milky Way

Question 5

Population II stars contain more metals than Population I stars.

Accepted Answer

A) True 
 B)False

Question 6

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 7

Henrietta Leavitt discovered the period-luminosity relationship for ____________________.

Accepted Answer

The answer of Henrietta Leavitt discovered the period-luminosity relationship for...

Question 8

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.

Question 9

The density wave theory explains spurs and branches along the spiral arms.

Accepted Answer

A) True 
 B)False

Question 10

Astronomers before Shapely underestimated the size of the Milky Way galaxy because they lacked telescopes.

Accepted Answer

A) True 
 B)False

Question 11

The Herschels' grindstone model of the Milky Way star system was too small because

Accepted Answer

A)  they did not count the brightest stars. 
B)  they did not study the southern sky. 
C)  they did not have large enough telescopes. 
D)  they only observed stars in the disk of the galaxy and not the halo. 
E)  they did not know about interstellar dust clouds. 
A)  they did not count the brightest stars. 
B)  they did not study the southern sky. 
C)  they did not have large enough telescopes. 
D)  they only observed stars in the disk of the galaxy and not the halo. 
E)  they did not know about interstellar dust clouds.

Question 12

The center of our galaxy is located in the direction of the constellation of Orion.

Accepted Answer

A) True 
 B)False

Question 13

The energy source at the center of our galaxy is called

Accepted Answer

A)  Cygnus X-1. 
B)  the Orion arm. 
C)  the sun. 
D)  Sagittarius A*. 
A)  Cygnus X-1. 
B)  the Orion arm. 
C)  the sun. 
D)  Sagittarius A*.

Question 14

The period-luminosity relationship is primarily used for main-sequence stars.

Accepted Answer

A) True 
 B)False

Question 15

How did Harlow Shapley use the period-luminosity relationship of RR Lyrae variables to determine the size of the Milky Way galaxy?

Accepted Answer

A)  He determined the proper motion of globular clusters in the outer disk of the galaxy. 
B)  He found the distances to individual variables free floating in the halo. 
C)  He found the distances to open clusters found throughout the disk of the galaxy. 
D)  He found the distances to globular clusters distributed about the center of the galaxy. 
A)  He determined the proper motion of globular clusters in the outer disk of the galaxy. 
B)  He found the distances to individual variables free floating in the halo. 
C)  He found the distances to open clusters found throughout the disk of the galaxy. 
D)  He found the distances to globular clusters distributed about the center of the galaxy.

Question 16

Why does the rotation of our galaxy suggest that it is more massive than previously thought?

Accepted Answer

The answer of Why does the rotation of our galaxy...

Question 17

Who first determined that the energy/s emitted by (luminosity of) Cepheid variable stars is larger the longer their period of variation is?

Accepted Answer

A)  Henrietta Leavitt 
B)  Edwin Hubble 
C)  John Glenn 
D)  Carl Sagan 
E)  Harlow Shapley 
A)  Henrietta Leavitt 
B)  Edwin Hubble 
C)  John Glenn 
D)  Carl Sagan 
E)  Harlow Shapley

Question 18

Compare and contrast the properties of disk and halo stars.

Accepted Answer

The answer of Compare and contrast the properties of disk...

Question 19

The center of our galaxy shows signs of past eruptions.

Accepted Answer

A) True 
 B)False

Question 20

Globular clusters are primarily found in the ____________________ component of the Galaxy.

Accepted Answer

The answer of Globular clusters are primarily found in the...

What is the difference between a population I star and a population II star?

This is a "thought" question. Why are few galaxies outside our own galaxy seen in the circle around the sky where the Milky Way is located? This is because

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

How do theories of the origin of the Milky Way explain its halo?

Population II stars contain more metals than Population I stars.

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

Henrietta Leavitt discovered the period-luminosity relationship for ____________________.

The chemical abundance of population I stars

The density wave theory explains spurs and branches along the spiral arms.

Astronomers before Shapely underestimated the size of the Milky Way galaxy because they lacked telescopes.

The Herschels' grindstone model of the Milky Way star system was too small because

The center of our galaxy is located in the direction of the constellation of Orion.

The energy source at the center of our galaxy is called

The period-luminosity relationship is primarily used for main-sequence stars.

How did Harlow Shapley use the period-luminosity relationship of RR Lyrae variables to determine the size of the Milky Way galaxy?

Why does the rotation of our galaxy suggest that it is more massive than previously thought?

Who first determined that the energy/s emitted by (luminosity of) Cepheid variable stars is larger the longer their period of variation is?

Compare and contrast the properties of disk and halo stars.

The center of our galaxy shows signs of past eruptions.

Globular clusters are primarily found in the ____________________ component of the 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

Exam 12: The Milky Way Galaxy

What is the difference between a population I star and a population II star?

This is a "thought" question. Why are few galaxies outside our own galaxy seen in the circle around the sky where the Milky Way is located? This is because

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

How do theories of the origin of the Milky Way explain its halo?

Population II stars contain more metals than Population I stars.

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

Henrietta Leavitt discovered the period-luminosity relationship for ____________________.

The chemical abundance of population I stars

The density wave theory explains spurs and branches along the spiral arms.

Astronomers before Shapely underestimated the size of the Milky Way galaxy because they lacked telescopes.

The Herschels' grindstone model of the Milky Way star system was too small because

The center of our galaxy is located in the direction of the constellation of Orion.

The energy source at the center of our galaxy is called

The period-luminosity relationship is primarily used for main-sequence stars.

How did Harlow Shapley use the period-luminosity relationship of RR Lyrae variables to determine the size of the Milky Way galaxy?

Why does the rotation of our galaxy suggest that it is more massive than previously thought?

Who first determined that the energy/s emitted by (luminosity of) Cepheid variable stars is larger the longer their period of variation is?

Compare and contrast the properties of disk and halo stars.

The center of our galaxy shows signs of past eruptions.

Globular clusters are primarily found in the ____________________ component of the 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