Question 1

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" shapeF) A) and D)
G) C) and D)

Question 2

Stars that formed in the very early stages of our galaxy's formation have high amounts of "metals."

Accepted Answer

A) True 
 B)False

Question 3

____ are crucial in determining the distance to objects that are far away, but still in the Milky Way galaxy.

Accepted Answer

A)   RR Lyrae stars
B)   Cepheid variable stars
C)   O and B stars
D)   Emission nebulae
E)   SupernovaeF) A) and E)
G) A) and B)

Question 4

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)   supernovaeF) C) and E)
G) A) and E)

Question 5

An astronomer named _______________ used globular clusters to locate the center of the galaxy. (enter last name only)

Accepted Answer

The answer of An astronomer named _______________ used globular clusters...

Question 6

The best explanation for the activity at the center of the galaxy is a(n)  ____.

Accepted Answer

A)   supercluster of O and B stars
B)   black hole with a mass several thousand times the Sun's
C)   giant atomic hydrogen cloud energized into a single, massive emission nebula
D)   black hole with a mass several million times the Sun's
E)   exotic object known as a "magnetar"F) B) and C)
G) A) and E)

Question 7

How have astronomers determined the mass of the Milky Way's supermassive black hole?

Accepted Answer

Stars near the galactic center...

Question 8

What is the correct ordering of galactic components using the new bottom-up hypothesis starting from oldest to youngest?

Accepted Answer

A)   galactic halo, average globular clusters, galactic disk
B)   galactic halo, galactic disk, average globular clusters
C)   average globular clusters, galactic halo, galactic disk
D)   average globular clusters, galactic disk, galactic halo
E)   galactic disk, average globular clusters, galactic halo.F) A) and C)
G) A) and B)

Question 9

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 associationsF) D) and E)
G) B) and E)

Question 10

Why is it surprising that spiral arms are stable structures, lasting billions of years?

Accepted Answer

A)   Differential rotation should tear the arms apart.
B)   Gas and dust clouds should run out of material to make young stars.
C)   Supernova explosions should disrupt the arms.
D)   Globular clusters are continuously passing through the arms.
E)   Gravity should pull the arms down into the center of the galaxy.F) A) and C)
G) A) and E)

Question 11

A "galactic fountain" is _____.

Accepted Answer

A)   a stream of gas and dust being pulled into a galaxy as it forms
B)   a jet of high-speed superheated material thrown out of the accretion disk around a black hole
C)   a partial spiral arm formed by the collision of molecular clouds
D)   a bubble of hot, metal-rich gas ejected from the disk by a burst of supernova
E)   a stream of gas made from a star that has been torn apart while falling into a supermassive black holeF) C) and D)
G) A) and B) D

Question 12

Match between columns
                        Premises: billions of Population II stars
billions of Population II stars
billions of Population I stars

Accepted Answer

The Answer of galactic disk and galactic corona and galactic is...

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

O and B stars are important spiral tracers.

Accepted Answer

A) True 
 B)False

Question 15

Discuss the evidence that supports the theory that there is a supermassive black hole at the center of our galaxy.

Accepted Answer

There is an intense source of radio ener...

Question 16

Which statement about stellar populations is correct?

Accepted Answer

A)   Population I stars are found in the disk and halo; Population II stars are found in the bulge.
B)   Population I stars are found in the halo; Population II stars are found in the disk and bulge.
C)   Population I stars are found in the disk; Population II stars are found in the bulge and halo.
D)   Population II stars are found in the disk; Population I stars are found in the bulge and halo.
E)   Population I stars are found in the bulge; Population II stars are found in the disk and halo.F) D) and E)
G) All of the above C

Question 17

The Sun orbits the center of the galaxy about once every ____.

Accepted Answer

A)   200,000 years
B)   2,000,000 years
C)   20,000,000 years
D)   200,000,000 years
E)   2,000,000,000 yearsF) B) and D)
G) B) and E)

Question 18

In the late 18th century, two astronomers, both with the last name of _______________, were the first to attempt to map the shape of the galaxy.

Accepted Answer

The answer of In the late 18th century, two astronomers,...

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 15: The Milky Way Galaxy

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

Correct Answer
verified

Stars that formed in the very early stages of our galaxy's formation have high amounts of "metals."

Correct Answer
verified

____ are crucial in determining the distance to objects that are far away, but still in the Milky Way galaxy.

Correct Answer
verified

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

Correct Answer
verified

An astronomer named _______________ used globular clusters to locate the center of the galaxy. (enter last name only)

Correct Answer
verified

The best explanation for the activity at the center of the galaxy is a(n) ____.

Correct Answer
verified

How have astronomers determined the mass of the Milky Way's supermassive black hole?

Correct Answer
verified
Stars near the galactic center...
View Answer

What is the correct ordering of galactic components using the new bottom-up hypothesis starting from oldest to youngest?

Correct Answer
verified

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

Correct Answer
verified

Why is it surprising that spiral arms are stable structures, lasting billions of years?

Correct Answer
verified

A "galactic fountain" is _____.

Correct Answer
verified
D

Match the regions of the galaxy listed below with the object or material with which it is most closely associated.

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

Correct Answer
verified

O and B stars are important spiral tracers.

Correct Answer
verified

Discuss the evidence that supports the theory that there is a supermassive black hole at the center of our galaxy.

Correct Answer
verified
There is an intense source of radio ener...
View Answer

Which statement about stellar populations is correct?

Correct Answer
verified
C

The Sun orbits the center of the galaxy about once every ____.

Correct Answer
verified

In the late 18th century, two astronomers, both with the last name of _______________, were the first to attempt to map the shape of the galaxy.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Exam 15: The Milky Way Galaxy

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

Correct AnswerverifiedShow Answer

Stars that formed in the very early stages of our galaxy's formation have high amounts of "metals."

Correct AnswerverifiedShow Answer

____ are crucial in determining the distance to objects that are far away, but still in the Milky Way galaxy.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An astronomer named _______________ used globular clusters to locate the center of the galaxy. (enter last name only)

Correct AnswerverifiedShow Answer

The best explanation for the activity at the center of the galaxy is a(n) ____.

Correct AnswerverifiedShow Answer

How have astronomers determined the mass of the Milky Way's supermassive black hole?

Correct AnswerverifiedStars near the galactic center...View AnswerShow Answer

What is the correct ordering of galactic components using the new bottom-up hypothesis starting from oldest to youngest?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Why is it surprising that spiral arms are stable structures, lasting billions of years?

Correct AnswerverifiedShow Answer

A "galactic fountain" is _____.

Correct AnswerverifiedD

Match the regions of the galaxy listed below with the object or material with which it is most closely associated.

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

Correct AnswerverifiedShow Answer

O and B stars are important spiral tracers.

Correct AnswerverifiedShow Answer

Discuss the evidence that supports the theory that there is a supermassive black hole at the center of our galaxy.

Correct AnswerverifiedThere is an intense source of radio ener...View AnswerShow Answer

Which statement about stellar populations is correct?

Correct AnswerverifiedC

The Sun orbits the center of the galaxy about once every ____.

Correct AnswerverifiedShow Answer

In the late 18th century, two astronomers, both with the last name of _______________, were the first to attempt to map the shape of the galaxy.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified
Stars near the galactic center...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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D

Correct Answer
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Correct Answer
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Correct Answer
verified
There is an intense source of radio ener...
View Answer

Correct Answer
verified
C

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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