Question 1

The quasar epoch ended when the galactic merger rate .

Accepted Answer

The answer of The quasar epoch ended when the galactic...

Question 2

The galaxies that reveal their motion through the intergalactic medium are called
.

Accepted Answer

head- tail...

Question 3

Collisions between galaxies have little effect on the individual stars.

Accepted Answer

A) True 
 B)False

Question 4

Collisions between galaxies are thought to

Accepted Answer

A)   be commonplace.
B)   have only occurred between 10 and 15 billion years ago.
C)   have stopped about 5 billion years ago.
D)   be extremely rare.
E)   have never occurred.F) B) and C)
G) C) and D)

Question 5

Redshift surveys are designed to find which galaxies are oldest and youngest.

Accepted Answer

A) True 
 B)False

Question 6

It is currently believed that superclusters lie on the surfaces of "bubbles" in space.

Accepted Answer

A) True 
 B)False

Question 7

Some quasars show absorption spectra with a smaller redshift than their emission spectra. This indicates that

Accepted Answer

A)   they are much closer than previously thought.
B)   we still don't understand redshifts.
C)   there is cooler gas between us and the quasar.
D)   their black holes are still contracting.
E)   their black holes are still expanding.F) B) and D)
G) All of the above

Question 8

The percentage of dark matter in galactic clusters is less than the percentage in individual galaxies.

Accepted Answer

A) True 
 B)False

Question 9

What is the expected result from the merger of a large irregular and a small irregular galaxy?

Accepted Answer

A spiral g...

Question 10

The Milky Way is at the center of our Local Supercluster.

Accepted Answer

A) True 
 B)False

Question 11

No binary black hole has ever been detected.

Accepted Answer

A) True 
 B)False

Question 12

As with stars, binary galaxy pairs are useful in finding their total mass.

Accepted Answer

A) True 
 B)False

Question 13

Collisions between galaxies

Accepted Answer

A)   cause large numbers of stars to collide and explode.
B)   are the best explanation for gamma- ray burst events.
C)   cause the gas and dust clouds to collide, leading to rapid star formation.
D)   are much rarer than collisions between stars.
E)   can turn elliptical galaxies into spirals.F) B) and E)
G) B) and D)

Question 14

The "Great Wall" is the structure in the Large Magellanic Cloud near where Supernova 1987A occurred.

Accepted Answer

A) True 
 B)False

Question 15

The Great Wall is a huge sheet of galaxies that stretches for over 100 Mpc.

Accepted Answer

A) True 
 B)False

Question 16

What is true of galaxies at the larger redshifts compared to ones nearby?

Accepted Answer

A)   They appear smaller and more irregular.
B)   They are mostly giants.
C)   They are redder.
D)   They are almost all ellipticals.
E)   They appear larger and more regular.F) C) and E)
G) A) and E)

Question 17

How massive are the largest known galaxies?

Accepted Answer

A)   a few million solar masses
B)   a hundred million solar masses
C)   a few billion solar masses
D)   a trillion solar masses
E)   hundreds of trillions of solar massesF) A) and E)
G) A) and C)

Question 18

In the Local Group, how might even the Milky Way become a victim?

Accepted Answer

In the binary system of the Milky Way an...

Question 19

According to the HST data, very distant (and early)  galaxies tend to be

Accepted Answer

A)   larger and bluer that modern galaxies.
B)   very well formed into clusters of nothing but spirals.
C)   nothing but quasars.
D)   redder, due to the recession of the universe.
E)   smaller, bluer, and more irregular than modern ones.F) A) and D)
G) A) and C)

Question 20

Gravitational lensing of distant, faint irregular galaxies may be the key to

Accepted Answer

A)   determining galactic redshifts.
B)   quasar energy production.
C)   mapping dark matter.
D)   understanding active galactic nuclei.
E)   understanding galactic rotation curves.F) A) and D)
G) All of the above

Exam 17: Hubbles Law and Dark Matter: the Large-Scale Structure of the Cosmos

What is the expected result from the merger of a large irregular and a small irregular galaxy?

Correct AnswerverifiedA spiral g...View AnswerShow Answer

In the Local Group, how might even the Milky Way become a victim?

Correct AnswerverifiedIn the binary system of the Milky Way an...View AnswerShow Answer

The Great Wall is a huge sheet of galaxies that stretches for over 100 Mpc.

Correct AnswerverifiedShow Answer

Some quasars show absorption spectra with a smaller redshift than their emission spectra. This indicates that

Correct AnswerverifiedShow Answer

As with stars, binary galaxy pairs are useful in finding their total mass.

Correct AnswerverifiedShow Answer

No binary black hole has ever been detected.

Correct AnswerverifiedShow Answer

Collisions between galaxies have little effect on the individual stars.

Correct AnswerverifiedShow Answer

Redshift surveys are designed to find which galaxies are oldest and youngest.

Correct AnswerverifiedShow Answer

The percentage of dark matter in galactic clusters is less than the percentage in individual galaxies.

Correct AnswerverifiedShow Answer

How massive are the largest known galaxies?

Correct AnswerverifiedShow Answer

Gravitational lensing of distant, faint irregular galaxies may be the key to

Correct AnswerverifiedShow Answer

It is currently believed that superclusters lie on the surfaces of "bubbles" in space.

Correct AnswerverifiedShow Answer

What is true of galaxies at the larger redshifts compared to ones nearby?

Correct AnswerverifiedShow Answer

The quasar epoch ended when the galactic merger rate .

Correct AnswerverifiedShow Answer

Collisions between galaxies are thought to

Correct AnswerverifiedShow Answer

The Milky Way is at the center of our Local Supercluster.

Correct AnswerverifiedShow Answer

The galaxies that reveal their motion through the intergalactic medium are called .

Correct Answerverifiedhead- tail...View AnswerShow Answer

The "Great Wall" is the structure in the Large Magellanic Cloud near where Supernova 1987A occurred.

Correct AnswerverifiedShow Answer

Collisions between galaxies

Correct AnswerverifiedShow Answer

According to the HST data, very distant (and early) galaxies tend to be

Correct AnswerverifiedShow Answer

Correct Answer
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A spiral g...
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Correct Answer
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In the binary system of the Milky Way an...
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head- tail...
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Correct Answer
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