Question 1

The Milky Way Galaxy is a(n)__________ galaxy.

Accepted Answer

A)  irregular 
B)  elliptical 
C)  spiral 
D)  lenticular 
A)  irregular 
B)  elliptical 
C)  spiral 
D)  lenticular

Question 2

Why can the observed chemical abundance of a star tell you something about its age?

Accepted Answer

As a galaxy evolves,gas is converted to

Question 3

Stars in the Milky Way that are 12 to 13 billion years old are only found in globular clusters.

Accepted Answer

A) True 
 B)False

Question 4

Most of the mass in our galaxy is in the form of

Accepted Answer

A)  stars. 
B)  gas. 
C)  dust. 
D)  dark matter. 
A)  stars. 
B)  gas. 
C)  dust. 
D)  dark matter.

Question 5

Globular clusters,when compared to open clusters,generally

Accepted Answer

A)  are located closer to the center of the Milky Way. 
B)  are younger in age. 
C)  have fewer amounts of heavy elements. 
D)  All of the above 
A)  are located closer to the center of the Milky Way. 
B)  are younger in age. 
C)  have fewer amounts of heavy elements. 
D)  All of the above

Question 6

How many years does it take the Sun to complete one orbit around the Milky Way? Note that the Sun is traveling at approximately 220 km/s and is 26,000 light-years from the center of the Milky Way.

Accepted Answer

A)  180 thousand years 
B)  7 million years 
C)  35 million years 
D)  220 million years 
A)  180 thousand years 
B)  7 million years 
C)  35 million years 
D)  220 million years

Question 7

Which of the following are NOT found in our galaxy's halo?

Accepted Answer

A)  Globular clusters 
B)  Planetary nebulae 
C)  RR Lyrae stars 
D)  Clouds emitting 21-cm emission 
A)  Globular clusters 
B)  Planetary nebulae 
C)  RR Lyrae stars 
D)  Clouds emitting 21-cm emission

Question 8

A dwarf galaxy is currently being ripped apart and accreted onto the Milky Way.

Accepted Answer

A) True 
 B)False

Question 9

Halo stars formed before gas in the Milky Way collapsed to form the disk.

Accepted Answer

A) True 
 B)False

Question 10

Why do we know that at least one generation of stars formed and died before the Milky Way's globular clusters formed?

Accepted Answer

A)  All globular clusters reside in the disk of the Milky Way. 
B)  No globular cluster has zero heavy elements. 
C)  Globular clusters are 9-10 billion years old. 
D)  No globular cluster is older than 12 billion years. 
A)  All globular clusters reside in the disk of the Milky Way. 
B)  No globular cluster has zero heavy elements. 
C)  Globular clusters are 9-10 billion years old. 
D)  No globular cluster is older than 12 billion years.

Question 11

Describe the population of globular star clusters in the Milky Way: how many are there,where do they reside in the Milky Way,and how do their ages and chemical abundances compare to the Sun?

Accepted Answer

The Milky Way contains over 150 globular

Question 12

By comparing globular clusters,you find that Cluster A's RR Lyrae stars are 100 times fainter than Cluster B's RR Lyrae stars.You know that Cluster A's stars are 1.5 times more luminous than Cluster B's stars,because Cluster A is more metal-rich and somewhat younger.How do the clusters' distances compare?

Accepted Answer

A)  Cluster A is 10 times farther away than Cluster B. 
B)  Cluster A is 12 times farther away than Cluster B. 
C)  Cluster A is 7 times farther away than Cluster B. 
D)  There is not enough information given to determine the clusters' relative distances. 
A)  Cluster A is 10 times farther away than Cluster B. 
B)  Cluster A is 12 times farther away than Cluster B. 
C)  Cluster A is 7 times farther away than Cluster B. 
D)  There is not enough information given to determine the clusters' relative distances.

Question 13

The chemical abundance of a main-sequence star usually reflects how much nuclear burning has gone on inside it.

Accepted Answer

A) True 
 B)False

Question 14

Where are the most metal-rich stars found in the Milky Way?

Accepted Answer

A)  In the disk near the Sun 
B)  At the center 
C)  In the halo 
D)  In globular clusters 
A)  In the disk near the Sun 
B)  At the center 
C)  In the halo 
D)  In globular clusters

Question 15

Globular clusters have much higher stellar densities than the local solar neighborhood.

Accepted Answer

A) True 
 B)False

Question 16

Describe the basic scenario that describes the formation and evolution of the Milky Way,including a description of how the halo and disk formed.

Accepted Answer

Several protogalactic fragments began fo

Question 17

Describe a scale model of the disk of the Milky Way using a scale in which   light-years.Note that the diameter of the disk is approximately 100,000 light-years,the thickness of young stars is 500 light-years,and the thickness of the older stars is 4,000 light-years.

Accepted Answer

In this model,the disk would be 1 meter

Question 18

Describe the differences between the ages and chemical abundances of globular and open star clusters.

Accepted Answer

Globular clusters are very old,12-13 bil

Question 19

What is the main observational difficulty in observing the shape of the Milky Way?

Accepted Answer

We are seeing it fro

Question 20

Dark matter is very unlikely to be made up of planets,white dwarfs,or black holes because otherwise we would see stars being gravitationally lensed much more often.

Accepted Answer

A) True 
 B)False

Exam 20: The Milky Waya Normal Spiral Galaxy

The Milky Way Galaxy is a(n)__________ galaxy.

Why can the observed chemical abundance of a star tell you something about its age?

Stars in the Milky Way that are 12 to 13 billion years old are only found in globular clusters.

Most of the mass in our galaxy is in the form of

Globular clusters,when compared to open clusters,generally

How many years does it take the Sun to complete one orbit around the Milky Way? Note that the Sun is traveling at approximately 220 km/s and is 26,000 light-years from the center of the Milky Way.

Which of the following are NOT found in our galaxy's halo?

A dwarf galaxy is currently being ripped apart and accreted onto the Milky Way.

Halo stars formed before gas in the Milky Way collapsed to form the disk.

Why do we know that at least one generation of stars formed and died before the Milky Way's globular clusters formed?

Describe the population of globular star clusters in the Milky Way: how many are there,where do they reside in the Milky Way,and how do their ages and chemical abundances compare to the Sun?

The chemical abundance of a main-sequence star usually reflects how much nuclear burning has gone on inside it.

Where are the most metal-rich stars found in the Milky Way?

Globular clusters have much higher stellar densities than the local solar neighborhood.

Describe the basic scenario that describes the formation and evolution of the Milky Way,including a description of how the halo and disk formed.

Describe a scale model of the disk of the Milky Way using a scale in which light-years.Note that the diameter of the disk is approximately 100,000 light-years,the thickness of young stars is 500 light-years,and the thickness of the older stars is 4,000 light-years.

Describe the differences between the ages and chemical abundances of globular and open star clusters.

What is the main observational difficulty in observing the shape of the Milky Way?

Dark matter is very unlikely to be made up of planets,white dwarfs,or black holes because otherwise we would see stars being gravitationally lensed much more often.

Why Learn Astronomy

Patterns in the Skymotions of Earth

Gravity and Orbitsa Celestial Ballet

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquidthe Giant Planets

Gravity Is More Than Keplers Laws

Planetary Adornmentsmoons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

A Run-Of-The-Mill G-Type Starour Sun

Star Formation and the Interstellar Medium

Stars in the Slow Lanelow-Mass Stellar Evolution

Live Fast,die Younghigh-Mass Stellar Evolution

Our Expanding Universe

Galaxies

Modern Cosmology

The Origin of Structure

Life

Filters