Question 1

A partial, or detached, segment of a spiral arm is referred to as a(n) " _______________."

Accepted Answer

The answer of A partial, or detached, segment of a...

Question 2

Galactic fountains are an important way to explain _____.

Accepted Answer

A)  the distribution of metals in and above the plane of the galactic disk 
B)  the nature of dark matter 
C)  the formation of the galactic disk from the first stages of our galaxy 
D)  the generation and support of spiral density waves 
E)  why the spiral arms are active sites of star formation 
A)  the distribution of metals in and above the plane of the galactic disk 
B)  the nature of dark matter 
C)  the formation of the galactic disk from the first stages of our galaxy 
D)  the generation and support of spiral density waves 
E)  why the spiral arms are active sites of star formation

Question 3

Why are Cepheid variables so important to the study of the Milky Way Galaxy?

Accepted Answer

Cepheid variables have a known relations

Question 4

The center of the galaxy has been studied extensively using visible light.

Accepted Answer

A) True 
 B)False

Question 5

What parts of the galaxy are considered to make up the "spherical component"?

Accepted Answer

The central bulge and halo of

Question 6

Spiral density wave theory and self-sustaining star formation are ways to explain why ____.

Accepted Answer

A)  stars orbit the galaxy with different periods at different distances from the center 
B)  sun-like stars are evenly distributed through the disk of the galaxy 
C)  dark matter affects the orbit of stars outside the visible disk of the galaxy 
D)  molecular clouds are compressed forming young stars along spiral arms 
E)  the central bulge of the galaxy has a "bar" shape 
A)  stars orbit the galaxy with different periods at different distances from the center 
B)  sun-like stars are evenly distributed through the disk of the galaxy 
C)  dark matter affects the orbit of stars outside the visible disk of the galaxy 
D)  molecular clouds are compressed forming young stars along spiral arms 
E)  the central bulge of the galaxy has a "bar" shape

Question 7

Harlow Shapley used observations of globular clusters to determine the position of the center of the galaxy.

Accepted Answer

A) True 
 B)False

Question 8

Harlow Shapley made the first accurate determination of the position of the center of the galaxy by studying ____.

Accepted Answer

A)  globular clusters 
B)  open clusters 
C)  emission nebulae 
D)  spiral tracers 
E)  stellar associations 
A)  globular clusters 
B)  open clusters 
C)  emission nebulae 
D)  spiral tracers 
E)  stellar associations

Question 9

Explain the reasoning that leads astronomers to believe that our galaxy is surrounded by a cloud of "dark matter".

Accepted Answer

Stars rotate around the galactic center

Question 10

Objects used to map spiral arms are called spiral _______________.

Accepted Answer

The answer of Objects used to map spiral arms are...

Question 11

Describe the general features of the monolithic collapse hypothesis, with an explanation of how the two different stellar populations are explained by the model.

Accepted Answer

In the monolithic collapse hypothesis, t

Question 12

The first stars formed in the Universe were composed of 90% hydrogen, 10% helium, and very little else.

Accepted Answer

A) True 
 B)False

Question 13

What is the monolithic collapse hypothesis unable to explain?

Accepted Answer

A)  The randomly oriented, elongated orbits of stars in the bulge and halo 
B)  The circular motion of stars in the galactic disk 
C)  The difference in metallicity between the spherical component and the disk component of the galaxy 
D)  The elongated bar shape of the central bulge 
E)  The low density of material in the halo, compared to the central bulge 
A)  The randomly oriented, elongated orbits of stars in the bulge and halo 
B)  The circular motion of stars in the galactic disk 
C)  The difference in metallicity between the spherical component and the disk component of the galaxy 
D)  The elongated bar shape of the central bulge 
E)  The low density of material in the halo, compared to the central bulge

Question 14

Spiral arms are obvious-easily-seen features-because they contain ____.

Accepted Answer

A)  dense molecular clouds 
B)  atomic hydrogen clouds 
C)  sun-like stars 
D)  OB associations 
E)  supernovae 
A)  dense molecular clouds 
B)  atomic hydrogen clouds 
C)  sun-like stars 
D)  OB associations 
E)  supernovae

Question 15

Match between columns
                        Premises: Halo
Sun
Globular cluster
Disk
Central bulge

Accepted Answer

The Answer of Region B and Region D and Region is...

Question 16

Globular clusters are used as spiral tracers.

Accepted Answer

A) True 
 B)False

Question 17

O stars must be formed in spiral arms because _____.

Accepted Answer

A)  they do not live long enough to move out of the arm 
B)  the dust clouds they form from are only found there 
C)  all stars are formed in spiral arms 
D)  they are only found in spiral arms their gravitational forces takes them to that location 
E)  they are left behind and found in the region behind the spiral arm 
A)  they do not live long enough to move out of the arm 
B)  the dust clouds they form from are only found there 
C)  all stars are formed in spiral arms 
D)  they are only found in spiral arms their gravitational forces takes them to that location 
E)  they are left behind and found in the region behind the spiral arm

Question 18

O and B stars are important spiral tracers.

Accepted Answer

A) True 
 B)False

Question 19

William and Caroline Herschel attempted to make a map of the Milky Way galaxy by counting the number of stars visible in different directions.

Accepted Answer

A) True 
 B)False

Question 20

_______________ variable stars are useful in measuring the distance to globular clusters.

Accepted Answer

The answer of _______________ variable stars are useful in measuring...

Exam 15: The Milky Way Galaxy

A partial, or detached, segment of a spiral arm is referred to as a(n) " _______________."

Galactic fountains are an important way to explain _____.

Why are Cepheid variables so important to the study of the Milky Way Galaxy?

The center of the galaxy has been studied extensively using visible light.

What parts of the galaxy are considered to make up the "spherical component"?

Spiral density wave theory and self-sustaining star formation are ways to explain why ____.

Harlow Shapley used observations of globular clusters to determine the position of the center of the galaxy.

Harlow Shapley made the first accurate determination of the position of the center of the galaxy by studying ____.

Explain the reasoning that leads astronomers to believe that our galaxy is surrounded by a cloud of "dark matter".

Objects used to map spiral arms are called spiral _______________.

Describe the general features of the monolithic collapse hypothesis, with an explanation of how the two different stellar populations are explained by the model.

The first stars formed in the Universe were composed of 90% hydrogen, 10% helium, and very little else.

What is the monolithic collapse hypothesis unable to explain?

Spiral arms are obvious-easily-seen features-because they contain ____.

Globular clusters are used as spiral tracers.

O stars must be formed in spiral arms because _____.

O and B stars are important spiral tracers.

William and Caroline Herschel attempted to make a map of the Milky Way galaxy by counting the number of stars visible in different directions.

_______________ variable stars are useful in measuring the distance to globular clusters.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Interstellar Medium

Formation and Structure of Stars

Stellar Evolution

Deaths of Stars

Neutron Stars and Black Holes

Galaxies

Supermassive Black Holes and Active Galaxies

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth the Active Planet

The Moon and Mercury

Venus and Mars

Jupiter and Saturn

Uranus Neptune Pluto and the Kuiper Belt

Meteorites Asteroids and Comets

Astrobiology

Filters