Question 1

The blue shaded region shown in the H-R diagram above is known as the Cepheid variable strip.

Accepted Answer

A) True 
 B)False

Question 2

O and B stars are examples of ________________ that are used to outline the arms in a galaxy like the Milky Way galaxy.

Accepted Answer

The answer of O and B stars are examples of...

Question 3

Nucleosynthesis

Accepted Answer

A)  is the process by which energy is produced at the center of the galaxy. 
B)  is the process by which hydrogen and helium are converted into heavier elements. 
C)  describes the structure of a globular cluster. 
D)  describes how the magnetic field of the galaxy traps cosmic rays. 
E)  describes the method by which neutral hydrogen produces 21-cm radiation. 
A)  is the process by which energy is produced at the center of the galaxy. 
B)  is the process by which hydrogen and helium are converted into heavier elements. 
C)  describes the structure of a globular cluster. 
D)  describes how the magnetic field of the galaxy traps cosmic rays. 
E)  describes the method by which neutral hydrogen produces 21-cm radiation.

Question 4

Henrietta Leavitt discovered the period-luminosity relationship for ____________________.

Accepted Answer

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

Question 5

Pulsating variable stars are useful in determining

Accepted Answer

A)  the mass of a star for which the distance is known. 
B)  the temperature of a star for which we know the luminosity. 
C)  the radius of the bulge of our galaxy. 
D)  the distance to globular clusters. 
E)  the mass of the Milky Way galaxy. 
A)  the mass of a star for which the distance is known. 
B)  the temperature of a star for which we know the luminosity. 
C)  the radius of the bulge of our galaxy. 
D)  the distance to globular clusters. 
E)  the mass of the Milky Way galaxy.

Question 6

The disk of the Milky Way is approximately 20,000 ly in diameter.

Accepted Answer

A) True 
 B)False

Question 7

The above light curve shows a period that indicates ________________________.

Accepted Answer

A)  the star gets dimmer quickly and brighter gradually 
B)  the star gets brighter quickly and dimmer gradually 
C)  the binary star system has an elliptical orbit 
D)  the system remains at constant absolute magnitude 
A)  the star gets dimmer quickly and brighter gradually 
B)  the star gets brighter quickly and dimmer gradually 
C)  the binary star system has an elliptical orbit 
D)  the system remains at constant absolute magnitude

Question 8

What kind of galaxy is shown above?

Accepted Answer

A)  flocculent 
B)  grand design 
C)  wooly 
D)  None of the other choices are correct. 
A)  flocculent 
B)  grand design 
C)  wooly 
D)  None of the other choices are correct.

Question 9

The galactic halo or corona is believed to contain mostly

Accepted Answer

A)  O and B stars. 
B)  G, K, and M stars. 
C)  open clusters. 
D)  globular clusters. 
E)  dark matter. 
A)  O and B stars. 
B)  G, K, and M stars. 
C)  open clusters. 
D)  globular clusters. 
E)  dark matter.

Question 10

Younger stars have more heavy elements because

Accepted Answer

A)  old stars destroy heavy elements as they age. 
B)  young stars burn their nuclear fuels faster. 
C)  the heavy elements were made in previous generations of stars. 
D)  heavy elements haven't had time to settle to the core of these younger stars. 
E)  All of the other choices are correct. 
A)  old stars destroy heavy elements as they age. 
B)  young stars burn their nuclear fuels faster. 
C)  the heavy elements were made in previous generations of stars. 
D)  heavy elements haven't had time to settle to the core of these younger stars. 
E)  All of the other choices are correct.

Question 11

The center of the Milky Way galaxy must be less than 1 AU in diameter and contain at least 4 million solar masses. Therefore, the center of the Milky Way galaxy must be a ____________________,

Accepted Answer

supermassi

Question 12

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

Accepted Answer

Spiral arms are dynamically stable regio

Question 13

What evidence do we have that the center of our galaxy contains magnetic fields?

Accepted Answer

​ Peculiar features

Question 14

How did Harlow Shapley determine where the center of the galaxy lies?

Accepted Answer

A)  He plotted the distribution of open clusters. 
B)  He plotted the distribution of globular clusters. 
C)  He made star counts in every direction of the galactic disk. 
D)  He measured the amount of dust obscuration in every direction of the galactic disk. 
A)  He plotted the distribution of open clusters. 
B)  He plotted the distribution of globular clusters. 
C)  He made star counts in every direction of the galactic disk. 
D)  He measured the amount of dust obscuration in every direction of the galactic disk.

Question 15

This is a "thought" question. Why are few galaxies outside our own galaxy seen by our eyes 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)  a massive explosion 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)  a massive explosion has blown galaxies away from those directions.

Question 16

Our galaxy is suspected to be surrounded by a galactic halo or corona because the disk of the galaxy

Accepted Answer

A)  rotates faster than expected in its outer region. 
B)  rotates more slowly than expected in its outer region. 
C)  is only visible during a total eclipse of our Sun. 
D)  is surrounded above, below, and well beyond by the brightly glowing corona. 
A)  rotates faster than expected in its outer region. 
B)  rotates more slowly than expected in its outer region. 
C)  is only visible during a total eclipse of our Sun. 
D)  is surrounded above, below, and well beyond by the brightly glowing corona.

Question 17

Regions of compression that move at their own speed in the disk and are outlined by the spiral arms are _____________.

Accepted Answer

The answer of Regions of compression that move at their...

The blue shaded region shown in the H-R diagram above is known as the Cepheid variable strip.

O and B stars are examples of ________________ that are used to outline the arms in a galaxy like the Milky Way galaxy.

Nucleosynthesis

Henrietta Leavitt discovered the period-luminosity relationship for ____________________.

Pulsating variable stars are useful in determining

The disk of the Milky Way is approximately 20,000 ly in diameter.

The above light curve shows a period that indicates ________________________.

What kind of galaxy is shown above?

The galactic halo or corona is believed to contain mostly

Younger stars have more heavy elements because

The center of the Milky Way galaxy must be less than 1 AU in diameter and contain at least 4 million solar masses. Therefore, the center of the Milky Way galaxy must be a ____________________,

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 contains magnetic fields?

How did Harlow Shapley determine where the center of the galaxy lies?

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

Our galaxy is suspected to be surrounded by a galactic halo or corona because the disk of the galaxy

Regions of compression that move at their own speed in the disk and are outlined by the spiral arms are _____________.

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 blue shaded region shown in the H-R diagram above is known as the Cepheid variable strip.

O and B stars are examples of ________________ that are used to outline the arms in a galaxy like the Milky Way galaxy.

Nucleosynthesis

Henrietta Leavitt discovered the period-luminosity relationship for ____________________.

Pulsating variable stars are useful in determining

The disk of the Milky Way is approximately 20,000 ly in diameter.

The above light curve shows a period that indicates ________________________.

What kind of galaxy is shown above?

The galactic halo or corona is believed to contain mostly

Younger stars have more heavy elements because

The center of the Milky Way galaxy must be less than 1 AU in diameter and contain at least 4 million solar masses. Therefore, the center of the Milky Way galaxy must be a ____________________,

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 contains magnetic fields?

How did Harlow Shapley determine where the center of the galaxy lies?

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

Our galaxy is suspected to be surrounded by a galactic halo or corona because the disk of the galaxy

Regions of compression that move at their own speed in the disk and are outlined by the spiral arms are _____________.

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